Adds a 'Configure' tab to the Normal Subscriptions section in Settings.
This tab allows users to view and edit the subpath for the NormalSub service.
- Modified settings.html:
- Added new tab link and pane for NormalSub subpath configuration.
- Tab is only visible and accessible if NormalSub service is active.
- Extended JavaScript:
- `sendRequest` function now accepts an optional `postSuccessCallback`.
- Added `isValidSubPath` for client-side validation.
- `updateServiceUI` now manages visibility of the 'Configure' tab and fetches current subpath.
- Implemented `fetchNormalSubPath` to get subpath via API.
- Implemented `editNormalSubPath` to save subpath via API.
- Integrated new input into `validateForm` and added real-time validation.
- Updated `updateDecoyStatusUI` and its calls from `setupDecoy`/`stopDecoy` to use the new `postSuccessCallback` pattern for consistency.
- Standardized form IDs (e.g., `telegram_form`, `port_form`) for better targeting in `validateForm` and `updateServiceUI`.
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