feat(ai): Phase 24 C — Telegram /ai 動態控制 + Redis 狀態管理

新增 ai_control.py:
- /ai status: 所有 Provider 狀態 + 路由模式
- /ai router on/off: 動態切換 AIRouter (覆蓋 env var)
- /ai primary <provider>: 設定主要 Provider
- /ai enable/disable <provider>: 控制 Provider 啟停
- /ai cost: 費用統計
- 白名單: OPENCLAW_TG_USER_WHITELIST 保護

telegram_gateway.py:
- _handle_chat_message 加入 /ai 指令攔截路由
- 白名單未授權返回警告

openclaw.py:
- Redis 狀態覆蓋 env USE_AI_ROUTER (/ai router on/off 生效)
- Redis primary_provider 覆蓋路由決策 (/ai primary 生效)
- Redis disabled provider 過濾 (/ai disable 生效)

Redis Keys:
  ai:control:use_router
  ai:control:primary_provider
  ai:control:disabled:<provider>

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

apps/api/src/services/ai_control.py

@@ -0,0 +1,284 @@
+"""
+AI Control Service — Phase 24 C (2026-04-03 ogt)
+
+Telegram /ai 指令動態控制 AI Router 狀態
+- Redis 狀態優先於 env var
+- OPENCLAW_TG_USER_WHITELIST 白名單保護
+
+Redis Keys:
+  ai:control:use_router          "true"/"false" (覆蓋 USE_AI_ROUTER env)
+  ai:control:primary_provider    "openclaw_nemo"/"gemini"/"ollama"/"claude"
+  ai:control:disabled:<provider> "1" (TTL: 永久或手動清除)
+
+Usage:
+  /ai status       — 顯示所有 Provider 狀態 + 當前路由模式
+  /ai primary <p>  — 設定主要 Provider (openclaw_nemo/gemini/ollama/claude)
+  /ai enable <p>   — 啟用特定 Provider
+  /ai disable <p>  — 停用特定 Provider
+  /ai cost         — 顯示費用統計
+  /ai router on    — 啟用 AIRouter (覆蓋 env var)
+  /ai router off   — 停用 AIRouter (回滾到舊 fallback chain)
+"""
+
+import structlog
+
+logger = structlog.get_logger(__name__)
+
+# Redis Key 常數
+_AI_ROUTER_KEY = "ai:control:use_router"
+_PRIMARY_PROVIDER_KEY = "ai:control:primary_provider"
+_DISABLED_KEY_PREFIX = "ai:control:disabled:"
+
+VALID_PROVIDERS = {"openclaw_nemo", "gemini", "ollama", "claude", "nemotron"}
+
+
+async def _get_redis():
+    from src.core.redis_client import get_redis
+    return get_redis()
+
+
+async def get_ai_router_enabled() -> bool | None:
+    """
+    從 Redis 取得 AIRouter 啟用狀態。
+    回傳 None 表示未設定，使用 env var (USE_AI_ROUTER)。
+    """
+    try:
+        r = await _get_redis()
+        val = await r.get(_AI_ROUTER_KEY)
+        if val is None:
+            return None
+        return val.decode() == "true" if isinstance(val, bytes) else val == "true"
+    except Exception as e:
+        logger.warning("ai_control_redis_read_failed", key=_AI_ROUTER_KEY, error=str(e))
+        return None
+
+
+async def set_ai_router_enabled(enabled: bool) -> bool:
+    """設定 AIRouter 啟用狀態到 Redis"""
+    try:
+        r = await _get_redis()
+        await r.set(_AI_ROUTER_KEY, "true" if enabled else "false")
+        logger.info("ai_control_router_set", enabled=enabled)
+        return True
+    except Exception as e:
+        logger.error("ai_control_router_set_failed", error=str(e))
+        return False
+
+
+async def get_primary_provider() -> str | None:
+    """從 Redis 取得主要 Provider，None 表示使用 Router 智慧路由"""
+    try:
+        r = await _get_redis()
+        val = await r.get(_PRIMARY_PROVIDER_KEY)
+        if val is None:
+            return None
+        return val.decode() if isinstance(val, bytes) else val
+    except Exception:
+        return None
+
+
+async def set_primary_provider(provider: str) -> bool:
+    """設定主要 Provider 到 Redis"""
+    if provider not in VALID_PROVIDERS:
+        return False
+    try:
+        r = await _get_redis()
+        await r.set(_PRIMARY_PROVIDER_KEY, provider)
+        logger.info("ai_control_primary_set", provider=provider)
+        return True
+    except Exception as e:
+        logger.error("ai_control_primary_set_failed", error=str(e))
+        return False
+
+
+async def clear_primary_provider() -> bool:
+    """清除主要 Provider 設定（回歸智慧路由）"""
+    try:
+        r = await _get_redis()
+        await r.delete(_PRIMARY_PROVIDER_KEY)
+        return True
+    except Exception:
+        return False
+
+
+async def is_provider_disabled(provider: str) -> bool:
+    """檢查 Provider 是否被停用"""
+    try:
+        r = await _get_redis()
+        val = await r.get(f"{_DISABLED_KEY_PREFIX}{provider}")
+        return val is not None
+    except Exception:
+        return False
+
+
+async def set_provider_disabled(provider: str, disabled: bool) -> bool:
+    """設定 Provider 啟用/停用"""
+    if provider not in VALID_PROVIDERS:
+        return False
+    try:
+        r = await _get_redis()
+        key = f"{_DISABLED_KEY_PREFIX}{provider}"
+        if disabled:
+            await r.set(key, "1")
+        else:
+            await r.delete(key)
+        logger.info("ai_control_provider_set", provider=provider, disabled=disabled)
+        return True
+    except Exception as e:
+        logger.error("ai_control_provider_set_failed", error=str(e))
+        return False
+
+
+async def get_status_summary() -> str:
+    """
+    取得 AI 控制狀態摘要 (Telegram 格式 HTML)
+    """
+    from src.core.config import get_settings
+    settings = get_settings()
+
+    # AIRouter 狀態
+    redis_router = await get_ai_router_enabled()
+    if redis_router is not None:
+        router_status = "✅ ON (Redis 覆蓋)" if redis_router else "❌ OFF (Redis 覆蓋)"
+    else:
+        router_status = "✅ ON (env)" if settings.USE_AI_ROUTER else "❌ OFF (env)"
+
+    # Primary Provider
+    primary = await get_primary_provider()
+    primary_str = f"🎯 {primary}" if primary else "🤖 智慧路由 (AIRouter 決定)"
+
+    # Provider 狀態
+    provider_lines = []
+    for p in ["openclaw_nemo", "gemini", "ollama", "claude", "nemotron"]:
+        disabled = await is_provider_disabled(p)
+        icon = "❌" if disabled else "✅"
+        provider_lines.append(f"  {icon} {p}")
+
+    # 費用統計
+    cost_lines = []
+    try:
+        r = await _get_redis()
+        for p in ["openclaw_nemo", "gemini", "claude", "nemotron"]:
+            val = await r.get(f"ai_rate:total_cost:{p}")
+            if val:
+                cost = float(val)
+                if cost > 0:
+                    cost_lines.append(f"  💰 {p}: ${cost:.4f}")
+    except Exception:
+        cost_lines.append("  (費用統計不可用)")
+
+    providers_str = "\n".join(provider_lines)
+    costs_str = "\n".join(cost_lines) if cost_lines else "  (尚無費用記錄)"
+
+    return (
+        f"<b>🤖 AI Router 控制面板</b>\n\n"
+        f"<b>路由模式</b>: {router_status}\n"
+        f"<b>主要 Provider</b>: {primary_str}\n\n"
+        f"<b>Provider 狀態</b>:\n{providers_str}\n\n"
+        f"<b>費用統計</b>:\n{costs_str}\n\n"
+        f"<code>/ai primary &lt;provider&gt;</code> 切換\n"
+        f"<code>/ai router on/off</code> 開關 AIRouter\n"
+        f"<code>/ai enable/disable &lt;provider&gt;</code> 控制 Provider"
+    )
+
+
+async def handle_ai_command(text: str) -> str:
+    """
+    處理 /ai 指令，回傳 Telegram HTML 回應。
+
+    Args:
+        text: 完整訊息文字 (e.g., "/ai status", "/ai primary gemini")
+
+    Returns:
+        HTML 格式回應字串
+    """
+    parts = text.strip().split()
+    if len(parts) < 2:
+        return await get_status_summary()
+
+    sub = parts[1].lower()
+
+    if sub == "status":
+        return await get_status_summary()
+
+    elif sub == "router":
+        if len(parts) < 3:
+            return "用法: <code>/ai router on</code> 或 <code>/ai router off</code>"
+        action = parts[2].lower()
+        if action in ("on", "true", "enable"):
+            ok = await set_ai_router_enabled(True)
+            return "✅ AIRouter 已啟用 (Redis 覆蓋)" if ok else "❌ 寫入 Redis 失敗"
+        elif action in ("off", "false", "disable"):
+            ok = await set_ai_router_enabled(False)
+            return "⚠️ AIRouter 已停用，回滾舊 fallback chain (Redis 覆蓋)" if ok else "❌ 寫入 Redis 失敗"
+        else:
+            return f"❌ 未知動作: {action}，請用 on/off"
+
+    elif sub == "primary":
+        if len(parts) < 3:
+            current = await get_primary_provider()
+            if current:
+                return f"當前主要 Provider: <b>{current}</b>\n用法: <code>/ai primary &lt;provider&gt;</code> 或 <code>/ai primary auto</code>"
+            return "當前: 🤖 智慧路由\n用法: <code>/ai primary &lt;provider&gt;</code>"
+        provider = parts[2].lower()
+        if provider == "auto":
+            ok = await clear_primary_provider()
+            return "✅ 已清除主要 Provider，恢復智慧路由" if ok else "❌ 操作失敗"
+        if provider not in VALID_PROVIDERS:
+            return f"❌ 未知 Provider: {provider}\n可用: {', '.join(sorted(VALID_PROVIDERS))}"
+        ok = await set_primary_provider(provider)
+        return f"✅ 主要 Provider 已設為 <b>{provider}</b>" if ok else "❌ 寫入 Redis 失敗"
+
+    elif sub == "enable":
+        if len(parts) < 3:
+            return "用法: <code>/ai enable &lt;provider&gt;</code>"
+        provider = parts[2].lower()
+        if provider not in VALID_PROVIDERS:
+            return f"❌ 未知 Provider: {provider}"
+        ok = await set_provider_disabled(provider, False)
+        return f"✅ {provider} 已啟用" if ok else "❌ 操作失敗"
+
+    elif sub == "disable":
+        if len(parts) < 3:
+            return "用法: <code>/ai disable &lt;provider&gt;</code>"
+        provider = parts[2].lower()
+        if provider not in VALID_PROVIDERS:
+            return f"❌ 未知 Provider: {provider}"
+        ok = await set_provider_disabled(provider, True)
+        return f"⚠️ {provider} 已停用" if ok else "❌ 操作失敗"
+
+    elif sub == "cost":
+        lines = ["<b>💰 AI 費用統計</b>\n"]
+        try:
+            r = await _get_redis()
+            total = 0.0
+            for p in ["openclaw_nemo", "gemini", "claude", "nemotron"]:
+                val = await r.get(f"ai_rate:total_cost:{p}")
+                if val:
+                    cost = float(val)
+                    total += cost
+                    if cost > 0:
+                        lines.append(f"  {p}: ${cost:.4f}")
+            if total > 0:
+                lines.append(f"\n  <b>總計: ${total:.4f}</b>")
+            else:
+                lines.append("  (尚無費用記錄)")
+        except Exception as e:
+            lines.append(f"  ⚠️ 費用查詢失敗: {e}")
+        return "\n".join(lines)
+
+    elif sub == "help":
+        return (
+            "<b>/ai 指令說明</b>\n\n"
+            "<code>/ai status</code> — 顯示所有狀態\n"
+            "<code>/ai router on/off</code> — 開關 AIRouter\n"
+            "<code>/ai primary &lt;p&gt;</code> — 設主要 Provider\n"
+            "<code>/ai primary auto</code> — 恢復智慧路由\n"
+            "<code>/ai enable &lt;p&gt;</code> — 啟用 Provider\n"
+            "<code>/ai disable &lt;p&gt;</code> — 停用 Provider\n"
+            "<code>/ai cost</code> — 費用統計\n\n"
+            f"可用 Provider: {', '.join(sorted(VALID_PROVIDERS))}"
+        )
+
+    else:
+        return f"❌ 未知子指令: {sub}\n輸入 <code>/ai help</code> 查看說明"