fix: delete agent 500 error + dynamic personality + deployment guide

- Fix delete agent 500: clean up FK records (agent_llm_logs, permissions,
  schedules, executions, team_members) and unbind goals/tasks before delete
- Remove hardcoded personality templates in Android, replace with dynamic
  system prompt generation from name + description
- Set promptSectionsEnabled=false to bypass PromptComposer for personality
- Add Tencent Cloud Linux deployment guide (Docker Compose)
- Accumulated backend service updates, frontend UI fixes, Android app changes

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

backend/app/api/fcm.py

@@ -0,0 +1,80 @@
+"""
+FCM 推送 API — Android 设备 Token 管理
+
+提供设备推送令牌的注册和注销接口。
+"""
+from __future__ import annotations
+
+import logging
+
+from fastapi import APIRouter, Depends, HTTPException
+from pydantic import BaseModel, Field
+
+from app.api.auth import get_current_user
+from app.core.database import SessionLocal
+from app.models.fcm_token import FcmToken
+from app.models.user import User
+
+logger = logging.getLogger(__name__)
+
+router = APIRouter(prefix="/api/v1/fcm", tags=["fcm"])
+
+
+class FcmRegisterRequest(BaseModel):
+    token: str = Field(..., min_length=32, max_length=512, description="FCM/APNs 设备令牌")
+    platform: str = Field(default="android", description="android / ios / web")
+
+
+@router.post("/register")
+async def register_fcm_token(
+    req: FcmRegisterRequest,
+    current_user: User = Depends(get_current_user),
+):
+    """注册设备推送 Token。同一 Token 多次注册会更新绑定用户和时间。"""
+    db = SessionLocal()
+    try:
+        existing = db.query(FcmToken).filter(FcmToken.token == req.token).first()
+
+        if existing:
+            existing.user_id = current_user.id
+            existing.platform = req.platform
+            db.commit()
+            logger.info("FCM Token 已更新: user=%s platform=%s", current_user.id, req.platform)
+            return {"status": "updated", "id": str(existing.id)}
+
+        fcm = FcmToken(
+            user_id=current_user.id,
+            token=req.token,
+            platform=req.platform,
+        )
+        db.add(fcm)
+        db.commit()
+        db.refresh(fcm)
+        logger.info("FCM Token 已注册: user=%s platform=%s", current_user.id, req.platform)
+        return {"status": "registered", "id": str(fcm.id)}
+    finally:
+        db.close()
+
+
+@router.delete("/unregister")
+async def unregister_fcm_token(
+    token: str,
+    current_user: User = Depends(get_current_user),
+):
+    """注销设备推送 Token。"""
+    db = SessionLocal()
+    try:
+        fcm = (
+            db.query(FcmToken)
+            .filter(FcmToken.token == token, FcmToken.user_id == current_user.id)
+            .first()
+        )
+        if fcm:
+            db.delete(fcm)
+            db.commit()
+            logger.info("FCM Token 已注销: user=%s", current_user.id)
+            return {"status": "deleted"}
+        return {"status": "not_found"}
+    finally:
+        db.close()
+