refactor: ClawBot → OpenClaw 全域更名

- 刪除舊版 clawbot.py (已有新版 openclaw.py)
- 更新 models/ai.py 類型定義 (ClawBotAnalysisRequest/Response)
- 更新 api/v1/ai.py import 與註解
- 更新 Discord username
- 更新所有註解與文檔

依據: feedback_openclaw_naming.md (統帥 2026-03-20 正式命名決議)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/api/src/models/ai.py

@@ -1,7 +1,7 @@
 """
 AI Decision Models - Phase 2 Structured Output
 ===============================================
-CAI-101: ClawBot AI 結構化輸出模型
+CAI-101: OpenClaw AI 結構化輸出模型
 
 防禦性工程鐵律:
 - 絕對禁止 LLM 輸出無法解析的自由文本
@@ -189,7 +189,7 @@ class OpenClawDecision(BaseModel):
         return v
 
 
-class ClawBotAnalysisRequest(BaseModel):
+class OpenClawAnalysisRequest(BaseModel):
     """分析請求"""
     force_refresh: bool = Field(
         default=False,
@@ -197,7 +197,7 @@ class ClawBotAnalysisRequest(BaseModel):
     )
 
 
-class ClawBotAnalysisResponse(BaseModel):
+class OpenClawAnalysisResponse(BaseModel):
     """分析回應"""
     success: bool
     message: str