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/push.py

@@ -0,0 +1,80 @@
+"""浏览器推送订阅 API"""
+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, get_optional_user
+from app.models.user import User
+from app.core.database import SessionLocal
+from app.models.push_subscription import PushSubscription
+
+logger = logging.getLogger(__name__)
+
+router = APIRouter(prefix="/api/v1/push", tags=["push"])
+
+
+class PushSubscriptionRequest(BaseModel):
+    endpoint: str = Field(..., description="Push 订阅端点 URL")
+    keys: dict = Field(..., description="包含 p256dh 和 auth")
+    user_agent: str = Field(default="", description="设备 UA")
+
+
+@router.post("/subscribe")
+async def subscribe_push(
+    req: PushSubscriptionRequest,
+    current_user: User = Depends(get_optional_user),
+):
+    """保存浏览器推送订阅。用户可选登录。"""
+    db = SessionLocal()
+    try:
+        # 检查是否已存在相同 endpoint
+        existing = db.query(PushSubscription).filter(
+            PushSubscription.endpoint == req.endpoint
+        ).first()
+
+        if existing:
+            # 更新已有记录
+            existing.p256dh = req.keys.get("p256dh", "")
+            existing.auth = req.keys.get("auth", "")
+            existing.user_id = str(current_user.id) if current_user else existing.user_id
+            existing.user_agent = req.user_agent
+            db.commit()
+            return {"status": "updated", "subscription_id": str(existing.id)}
+
+        sub = PushSubscription(
+            user_id=str(current_user.id) if current_user else None,
+            endpoint=req.endpoint,
+            p256dh=req.keys.get("p256dh", ""),
+            auth=req.keys.get("auth", ""),
+            user_agent=req.user_agent,
+        )
+        db.add(sub)
+        db.commit()
+        db.refresh(sub)
+        return {"status": "created", "subscription_id": str(sub.id)}
+    finally:
+        db.close()
+
+
+@router.delete("/unsubscribe")
+async def unsubscribe_push(
+    endpoint: str,
+    current_user: User = Depends(get_optional_user),
+):
+    """取消推送订阅。"""
+    db = SessionLocal()
+    try:
+        q = db.query(PushSubscription).filter(PushSubscription.endpoint == endpoint)
+        if current_user:
+            q = q.filter(PushSubscription.user_id == str(current_user.id))
+        sub = q.first()
+        if sub:
+            db.delete(sub)
+            db.commit()
+            return {"status": "deleted"}
+        return {"status": "not_found"}
+    finally:
+        db.close()