chore: 删除从未被调用的 /api/personal_dynamics 端点

`POST /api/personal_dynamics`（system_router.py）在 static/、templates/、
NEKO-PC/ 与运行期前端均 grep 不到任何调用方；后端唯一真正消费
personal_dynamics 数据的地方是 proactive_chat handler 内部直接
`await fetch_personal_dynamics(...)`，不经过自身的 HTTP 路由。

死代码 + 命名违和（资源型路径却用 POST），按"发现即清理"原则删除。
`fetch_personal_dynamics` / `format_personal_dynamics` / `_log_personal_dynamics`
全部保留——它们仍被 proactive_chat 使用。

同步删除 #1530 为该端点加的 CSRF canary 用例
（tests/unit/test_uncovered_endpoints_csrf.py 的 UNCOVERED_ENDPOINTS）：
端点删除后该参数化用例只会命中 404，而非其断言的 403，必须一并移除。
（已 rebase 到最新 main，解决 system_router.py 一处文本冲突。）

verified:
  uv run pytest tests/unit/test_uncovered_endpoints_csrf.py -> 14 passed
  uv run pytest tests/unit/ -k "personal or proactive" -> 201 passed

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: 2 people

main_routers/system_router.py

@@ -7481,54 +7481,6 @@ async def translate_text_api(request: Request):
             "target_lang": "zh"
         }
 
-# ========== 个性化内容接口 ==========
-
-@router.post('/personal_dynamics')
-async def get_personal_dynamics(request: Request):
-    """
-    获取个性化内容数据
-    """
-    validation_error = _validate_local_mutation_request(request)
-    if validation_error is not None:
-        return validation_error
-
-    from utils.web_scraper import fetch_personal_dynamics, format_personal_dynamics
-    try:
-
-        data = await request.json()
-        limit = data.get('limit', 10)
-
-        # 获取个性化内容
-        personal_content = await fetch_personal_dynamics(limit=limit)
-
-        if not personal_content['success']:
-            return JSONResponse({
-                "success": False,
-                "error": "无法获取个性化内容",
-                "detail": personal_content.get('error', '未知错误')
-            }, status_code=500)
-
-        # 格式化内容用于前端显示
-        formatted_content = format_personal_dynamics(personal_content)
-
-        return JSONResponse({
-            "success": True,
-            "data": {
-                "raw": personal_content,
-                "formatted": formatted_content,
-                "platforms": [k for k in personal_content.keys() if k not in ('success', 'error', 'region')]
-            }
-        })
-
-    except Exception as e:
-        logger.error(f"获取个性化内容失败: {e}")
-        return JSONResponse({
-            "success": False,
-            "error": "服务器内部错误",
-            "detail": str(e)
-        }, status_code=500)
-
-
 # Self-register the mini-game-invite keyword matcher with main_logic's
 # event bus. Same rationale as plugin/core/state.py: ``main_logic.core``
 # previously imported this function directly (a layering inversion);

tests/unit/test_uncovered_endpoints_csrf.py

@@ -47,7 +47,6 @@ def unauthenticated_client():
     ("/api/proactive_chat", {"json": {"lanlan_name": "Yui"}}),
     ("/api/proactive/music_played_through", {"json": {"lanlan_name": "Yui"}}),
     ("/api/translate", {"json": {"text": "hello", "target_lang": "zh"}}),
-    ("/api/personal_dynamics", {"json": {"limit": 5}}),
 ]