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/agent_runtime/context.py

@@ -80,6 +80,43 @@ class AgentContext:
         if not self._messages:
             self._system_prompt = prompt
 
+    # ──────────────────── 消息操作（为 Compaction 提供） ────────────────────
+
+    @property
+    def raw_messages(self) -> List[Dict[str, Any]]:
+        """获取原始消息列表（不含自动 prepend 的 system prompt）。
+
+        用于 CompactionEngine 直接操作 _messages，避免 system prompt 重复。
+        """
+        return self._messages
+
+    def replace_internal_messages(self, new_messages: List[Dict[str, Any]]) -> None:
+        """替换全部内部消息（CompactionEngine 用）。"""
+        self._messages = new_messages
+
+    def remove_messages_before(self, index: int) -> None:
+        """移除指定索引之前的所有消息（保留 system prompt 在首位时的位置）。
+
+        注意：不修改 _system_prompt；调用方通过 messages 属性获取时会自动 prepend。
+        """
+        if index > 0:
+            self._messages = self._messages[index:]
+
+    def replace_message_range(
+        self, start: int, end: int, new_messages: List[Dict[str, Any]]
+    ) -> None:
+        """替换消息列表中 [start, end) 区间的消息。"""
+        self._messages[start:end] = new_messages
+
+    def estimate_tokens(self, token_counter=None) -> int:
+        """估算当前消息列表的总 token 数（含 system prompt）。"""
+        from app.core.token_counter import TokenCounter
+        if token_counter is None:
+            token_counter = TokenCounter()
+        return token_counter.count_messages(self.messages)
+
+    # ──────────────────── 生命周期 ────────────────────
+
     def reset(self) -> None:
         """重置上下文（保留 system prompt 和 session_id）。"""
         self._messages = []