fix(web): unify operation history tracking for monorepo plugin operations (#240)

The operation history UI was reading from the wrong data source
(operation_queue instead of operation_history), install/update records
lacked version details, toggle operations used a type name that didn't
match UI filters, and the Clear History button was non-functional.

- Switch GET /plugins/operation/history to read from OperationHistory
  audit log with return type hint and targeted exception handling
- Add DELETE /plugins/operation/history endpoint; wire up Clear button
- Add _get_plugin_version helper with specific exception handling
  (FileNotFoundError, PermissionError, json.JSONDecodeError) and
  structured logging with plugin_id/path context
- Record plugin version, branch, and commit details on install/update
- Record install failures in the direct (non-queue) code path
- Replace "toggle" operation type with "enable"/"disable"
- Add normalizeStatus() in JS to map completed→success, error→failed
  so status filter works regardless of server-side convention
- Truncate commit SHAs to 7 chars in details display
- Fix HTML filter options, operation type colors, duplicate JS init

Co-authored-by: Chuck <chuck@example.com>
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

src/plugin_system/operation_history.py

@@ -167,6 +167,13 @@ class OperationHistory:
         
         return history[:limit]
     
+    def clear_history(self) -> None:
+        """Clear all operation history records."""
+        with self._lock:
+            self._history.clear()
+            self._save_history()
+        self.logger.info("Operation history cleared")
+
     def _save_history(self) -> None:
         """Save history to file."""
         if not self.history_file: