phsl / new-api

- Refactored the request URL and body construction methods to align with the Veo predictLongRunning endpoint.
- Introduced new data structures for Veo instances and parameters, replacing the previous Gemini video generation configurations.
- Updated the Vertex adaptor to utilize the new Veo request payload format.

feat: improve channel override ui/ux

feat(gemini): implement video generation configuration

feat: minimax reasoning_split

feat: add image model to supported image presets

fix: redirect subscription payment return to user-accessible page

- Added Gemini video generation configuration structures and payloads.
- Introduced functions for parsing and resolving video duration and resolution from metadata.
- Enhanced the Vertex adaptor to support Gemini video generation requests and billing estimation based on duration and resolution.
- Updated model pricing settings for new Gemini video models.

fix: show built-in user bindings from user detail API in admin modal

fix: vertex ai video proxy and task polling improvements

fix: align Vertex content fetch flow with Gemini and handle base64 

feat: add gemini-3-pro-image-preview/gemini-2.5-flash-image/gemini-3.1-flash-image-preview to supported image presets

# Conflicts:
#	relay/channel/api_request_test.go
#	relay/common/override_test.go
#	web/src/components/table/channels/modals/EditChannelModal.jsx

- Introduced RouteTag middleware to set route tags for different API endpoints.
- Updated logger to include route tags in log output.
- Applied RouteTag middleware across various routers including API, dashboard, relay, video, and web routers for consistent logging.

feat(web): add custom-model create hint and i18n translations

- Introduced a new test file for StreamScannerHandler, covering various scenarios including nil inputs, empty bodies, chunk processing, order preservation, and handler failures.
- Enhanced error handling and data processing logic in StreamScannerHandler to improve robustness and performance.

Fix/pr 2900

feat: move user bindings to dedicated management modal

fix: skip Accept-Encoding during header passthrough (#2214)

fix: violation fee check

- Added caching for the original Content-Type header in the parseMultipartFormData function.
- This change ensures that the Content-Type is retrieved from the context if previously set, enhancing performance and consistency.