refactor(statistic): decouple statistics collection from report generation

Introduces a dedicated `HTMLReportGenerator` class in `report_generator.py` to handle all aspects of HTML and chart rendering. This decouples the report presentation logic from the data collection process within `StatisticOutputTask`.

Key changes include:
- Migrated all HTML and JavaScript generation into the new `HTMLReportGenerator`.
- Extracted all statistic key constants into a separate `statistic_keys.py` file for improved organization.
- Renamed `_generate_chart_data` to `_collect_chart_data` to better reflect its purpose.
- Improved data handling robustness by using `.get()` for dictionary access and safely handling database query results.

src/main.py

@@ -400,7 +400,7 @@ MoFox_Bot(第三方修改版)
         base_init_tasks = [
             async_task_manager.add_task(OnlineTimeRecordTask()),
             async_task_manager.add_task(StatisticOutputTask()),
-            async_task_manager.add_task(TelemetryHeartBeatTask()),
+            #async_task_manager.add_task(TelemetryHeartBeatTask()),
         ]
 
         await asyncio.gather(*base_init_tasks, return_exceptions=True)