chore: update test coverage statistics in README and refactor message handlers

- Updated README with per-module test coverage percentages (99% overall, 310 tests, 100% pass rate)
  - Services: all at 100% coverage
  - Handlers: 5 at 100%, anti_spam at 98%
  - Database, Config, Constants: all at 100%
- Refactored message handler filters in src/bot/main.py for precision:
  - guard_warning_topic: process all messages (filters.ALL)
  - handle_new_user_spam: process only group messages (filters.ChatType.GROUPS)
  - handle_message: filter group messages excluding commands, moved to group=1 priority

Author: rezhajulio

README.md

@@ -150,15 +150,15 @@ uv run pytest -v
 ### Test Coverage
 
 The project maintains comprehensive test coverage:
-- **Coverage**: 99% across all modules (1,057 statements, 2 missed)
+- **Coverage**: 99% (1,057 statements, 2 missed)
 - **Tests**: 310 total
 - **Pass Rate**: 100% (310/310 passed)
 - **All modules**: 99% coverage including JobQueue scheduler integration, captcha verification, and anti-spam enforcement
-  - Services: `bot_info.py`, `scheduler.py`, `user_checker.py`, `telegram_utils.py`, `captcha_recovery.py`
-  - Handlers: `anti_spam.py`, `captcha.py`, `dm.py`, `message.py`, `topic_guard.py`, `verify.py`
-  - Database: `service.py`, `models.py`
-  - Config: `config.py`
-  - Constants: `constants.py`
+  - Services: `bot_info.py` (100%), `scheduler.py` (100%), `user_checker.py` (100%), `telegram_utils.py` (100%), `captcha_recovery.py` (100%)
+  - Handlers: `anti_spam.py` (98%), `captcha.py` (100%), `dm.py` (100%), `message.py` (100%), `topic_guard.py` (100%), `verify.py` (100%)
+  - Database: `service.py` (100%), `models.py` (100%)
+  - Config: `config.py` (100%)
+  - Constants: `constants.py` (100%)
 
 All modules are fully unit tested with:
 - Mocked async dependencies (telegram bot API calls)

src/bot/main.py

@@ -166,7 +166,7 @@ def main() -> None:
     # messages in the warning topic before other handlers process them
     application.add_handler(
         MessageHandler(
-            filters.ALL & ~filters.COMMAND,
+            filters.ALL,
             guard_warning_topic,
         ),
         group=-1,
@@ -223,7 +223,7 @@ def main() -> None:
     # Handler 8: New-user anti-spam handler - checks for forwards/links from users on probation
     application.add_handler(
         MessageHandler(
-            filters.ALL & ~filters.COMMAND,
+            filters.ChatType.GROUPS,
             handle_new_user_spam,
         )
     )
@@ -233,11 +233,12 @@ def main() -> None:
     # group and warns/restricts users with incomplete profiles
     application.add_handler(
         MessageHandler(
-            filters.TEXT & ~filters.COMMAND,
+            filters.ChatType.GROUPS & ~filters.COMMAND,
             handle_message,
-        )
+        ),
+        group=1,
     )
-    logger.info("Registered handler: message_handler (group=0)")
+    logger.info("Registered handler: message_handler (group=1)")
 
     # Register auto-restriction job to run every 5 minutes
     if application.job_queue: