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/execution.py

@@ -1,7 +1,7 @@
 """
 执行记录模型
 """
-from sqlalchemy import Column, String, Text, Integer, DateTime, JSON, ForeignKey, func
+from sqlalchemy import Column, String, Text, Integer, DateTime, JSON, ForeignKey, Index, func
 from sqlalchemy.dialects.mysql import CHAR
 from sqlalchemy.orm import relationship
 from app.core.database import Base
@@ -34,6 +34,7 @@ class Execution(Base):
     depth = Column(Integer, default=0, nullable=False, comment="执行深度（根为0）")
     pause_state = Column(JSON, nullable=True, comment="挂起快照（审批节点 HITL，恢复时消费）")
     goal_id = Column(CHAR(36), ForeignKey("goals.id"), nullable=True, comment="关联目标ID")
+    workspace_id = Column(CHAR(36), ForeignKey("workspaces.id"), nullable=True, comment="所属工作区ID")
     created_at = Column(DateTime, default=func.now(), comment="创建时间")
 
     # 关系