feat(api): Phase 13 智能路由 + CI/CD 整合 (#74-88)

Phase 13.1 CI/CD Integration:
- #76 workflow_run handler for CI failure diagnosis
- #77 SignOz log query (query_logs, error_logs_summary MCP)
- #78 CIAutoRepairService with risk-based execution decisions

Phase 13.3 Smart Routing:
- #85 Intent Classifier v2.0 (rule engine + LLM fallback)
- #86 Complexity Scorer (9-dimension scoring)
- #87 AI Router v3.0 (routing decision matrix)
- #88 Token Counter (OTEL + Langfuse integration)

New files:
- services/ci_auto_repair.py (risk stratification)
- services/model_registry.py (centralized model config)
- services/token_counter.py (677 lines)
- Skill 08: Model Router Expert
- Skill 09: Strangler Pattern Expert
- ADR-023: Smart Routing Architecture
- ADR-024: API Layer Architecture

Tests:
- phase11-conversational.spec.ts (E2E tests)

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

apps/api/src/services/signoz_client.py

@@ -418,6 +418,140 @@ class SignOzClient:
             },
         }
 
+    # =========================================================================
+    # Log Query (Phase 13.1 #77)
+    # =========================================================================
+
+    async def get_logs(
+        self,
+        service_name: str | None = None,
+        severity: str | None = None,
+        search_text: str | None = None,
+        time_window_minutes: int = 30,
+        limit: int = 100,
+    ) -> list[dict]:
+        """
+        從 SignOz/ClickHouse 查詢日誌 (Phase 13.1 #77)
+
+        SignOz 日誌儲存在 signoz_logs.distributed_logs 表
+        Schema: timestamp, severity_text, body, resources, attributes
+
+        Args:
+            service_name: 服務名稱 (過濾 resources.service.name)
+            severity: 日誌級別 (ERROR, WARN, INFO, DEBUG)
+            search_text: 日誌內容搜尋文字
+            time_window_minutes: 時間窗口 (分鐘)
+            limit: 返回筆數上限
+
+        Returns:
+            list[dict]: 日誌記錄列表
+        """
+        now = datetime.now(UTC)
+        start_ns = int((now - timedelta(minutes=time_window_minutes)).timestamp() * 1_000_000_000)
+        end_ns = int(now.timestamp() * 1_000_000_000)
+
+        # 構建 WHERE 條件
+        conditions = [
+            f"timestamp >= {start_ns}",
+            f"timestamp <= {end_ns}",
+        ]
+
+        if service_name:
+            # SignOz 儲存 service.name 在 resources 欄位
+            conditions.append(f"resources['service.name'] = '{service_name}'")
+
+        if severity:
+            # 支援多個級別 (如 'ERROR,WARN')
+            severities = [s.strip().upper() for s in severity.split(",")]
+            severity_list = ", ".join([f"'{s}'" for s in severities])
+            conditions.append(f"severity_text IN ({severity_list})")
+
+        if search_text:
+            # 日誌內容搜尋 (避免 SQL injection)
+            safe_text = search_text.replace("'", "''")
+            conditions.append(f"body LIKE '%{safe_text}%'")
+
+        where_clause = " AND ".join(conditions)
+
+        query = f"""
+        SELECT
+            timestamp,
+            severity_text,
+            body,
+            resources,
+            attributes,
+            trace_id,
+            span_id
+        FROM signoz_logs.distributed_logs
+        WHERE {where_clause}
+        ORDER BY timestamp DESC
+        LIMIT {limit}
+        """
+
+        results = await self._query_clickhouse(query)
+
+        # 格式化結果
+        formatted_logs = []
+        for row in results:
+            formatted_logs.append({
+                "timestamp": row.get("timestamp"),
+                "severity": row.get("severity_text", "UNKNOWN"),
+                "message": row.get("body", ""),
+                "service": row.get("resources", {}).get("service.name", "unknown"),
+                "trace_id": row.get("trace_id", ""),
+                "span_id": row.get("span_id", ""),
+                "attributes": row.get("attributes", {}),
+            })
+
+        logger.info(
+            "signoz_logs_query_completed",
+            service_name=service_name,
+            severity=severity,
+            result_count=len(formatted_logs),
+            time_window_minutes=time_window_minutes,
+        )
+
+        return formatted_logs
+
+    async def get_error_logs_summary(
+        self,
+        service_name: str,
+        time_window_minutes: int = 60,
+    ) -> dict:
+        """
+        取得錯誤日誌摘要 (Phase 13.1 #77 - CI 診斷用)
+
+        統計各類錯誤的出現次數和代表性訊息
+        """
+        now = datetime.now(UTC)
+        start_ns = int((now - timedelta(minutes=time_window_minutes)).timestamp() * 1_000_000_000)
+        end_ns = int(now.timestamp() * 1_000_000_000)
+
+        query = f"""
+        SELECT
+            severity_text,
+            count() as count,
+            any(body) as sample_message
+        FROM signoz_logs.distributed_logs
+        WHERE
+            timestamp >= {start_ns}
+            AND timestamp <= {end_ns}
+            AND resources['service.name'] = '{service_name}'
+            AND severity_text IN ('ERROR', 'FATAL', 'CRITICAL')
+        GROUP BY severity_text
+        ORDER BY count DESC
+        LIMIT 10
+        """
+
+        results = await self._query_clickhouse(query)
+
+        return {
+            "service_name": service_name,
+            "time_window_minutes": time_window_minutes,
+            "error_summary": results,
+            "total_errors": sum(r.get("count", 0) for r in results),
+        }
+
 
 # =============================================================================
 # Singleton