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/models/agent_schedule.py

@@ -1,7 +1,7 @@
 """Agent 定时任务表：按 cron 表达式周期执行 Agent"""
 import uuid
 from datetime import datetime
-from sqlalchemy import Column, String, Text, Integer, DateTime, ForeignKey, Boolean, JSON
+from sqlalchemy import Column, String, Text, Integer, DateTime, ForeignKey, Boolean, JSON, Index
 from sqlalchemy.dialects.mysql import CHAR
 from app.core.database import Base
 
@@ -25,6 +25,7 @@ class AgentSchedule(Base):
     last_run_status = Column(String(32), nullable=True, comment="上次执行状态: success/failed")
     next_run_at = Column(DateTime, nullable=False, comment="下次执行时间")
     user_id = Column(CHAR(36), ForeignKey("users.id"), nullable=False, index=True, comment="创建者 ID")
+    workspace_id = Column(CHAR(36), ForeignKey("workspaces.id"), nullable=True, comment="所属工作区ID")
     created_at = Column(DateTime, default=datetime.utcnow, comment="创建时间")
     updated_at = Column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow, comment="更新时间")