By moving provider-dependent init to didChangeDependencies. (dependOnInheritedWidget)

- Add StreamSubscription to manage ReceivePort listener lifecycle
- Introduce handshake timeout when waiting for isolate SendPort to prevent hangs
- Add response timeout in get<T>() to avoid indefinitely waiting for isolate replies
- Replace direct ReceivePort.listen with tracked subscription for safer cleanup
- Improve error handling for invalid or missing isolate responses
- Strengthen isolate startup reliability and shutdown consistency

- Introduce _addLog() helper to manage log insertion
- Enforce a maximum log history of 200 entries to prevent unbounded memory growth
- Replace direct _logsNotifier.value.add(event) with safe, immutable-style list update
- Improve log handling consistency and avoid mutating notifier state in place

- Added _initializedLocales to prevent repeated locale initialization
- Improved evaluateJavascriptViaWebview with safer lifecycle handling (try/finally + null checks)
- Minor cleanup and consistency improvements across MBridge utilities

- Replace list→set→list conversions with LinkedHashSet for stable ordering
- Ensure PageUrl uniqueness based on URL
- Ensure Video uniqueness based on url + originalUrl
- Add null‑safety checks when building PageUrl and Video objects
- Improve readability and reduce unnecessary allocations

This commit improves memory management, reduces redundant interpreter
instantiation, and standardizes service usage patterns.

- Add `dispose()` to `ExtensionService` interface and implement it across
  Dart, JS, LNReader, and Mihon services.
- Replace repeated interpreter creation in `DartExtensionService` with a
  persistent `_interpreter` instance initialized once in the constructor.
- Add disposal logic for JS DOM selector and Cheerio instances to prevent
  memory leaks.
- Introduce `withExtensionService()` helper to ensure services are always
  disposed after use.
- Update call sites across the codebase to use `withExtensionService()`
  or manual try/finally disposal.
- Improve isolate service message handling by extracting `responsePort`
  earlier.
- Ensure safer defaults (e.g., returning empty lists, const lists) when
  service calls fail.