fix: replace 59 bare except clauses with proper logging (#25)

All `except Exception:` now catch as `except Exception as exc:` with
appropriate logging (warning for critical paths, debug for graceful degradation).

Added logger setup to 4 files that lacked it:
- src/timmy/memory/vector_store.py
- src/dashboard/middleware/csrf.py
- src/dashboard/middleware/security_headers.py
- src/spark/memory.py

31 files changed across timmy core, dashboard, infrastructure, integrations.
Zero bare excepts remain. 1340 tests passing.

src/integrations/telegram_bot/bot.py

@@ -56,7 +56,8 @@ class TelegramBot:
             from config import settings
 
             return settings.telegram_token or None
-        except Exception:
+        except Exception as exc:
+            logger.warning("Telegram token load error: %s", exc)
             return None
 
     def save_token(self, token: str) -> None: