🎞️ feat: OpenRouter Audio/Video File Upload Support (#11070)

* Added video upload support for OpenRouter

- Added VIDEO_URL content type to support video_url message format
- Implemented OpenRouter video encoding using base64 data URLs
- Extended encodeAndFormatVideos() to handle OpenRouter provider
- Updated UI to accept video uploads for OpenRouter (mp4, webm, mpeg, mov)
- Fixed case-sensitivity in provider detection for agents
- Made isDocumentSupportedProvider() and isOpenAILikeProvider() case-insensitive

Videos are now converted to data:video/mp4;base64,... format compatible
with OpenRouter's API requirements per their documentation.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

* refactor: change multimodal and google_multimodal to more transparent variable names of image_document and image_document_video_audio

(also google_multimodal doesn't apply as much since we are adding support for video and audio uploads for open router)

* fix: revert .toLowerCase change to isOpenAILikeProvider and isDocumentSupportedProvider which broke upload to provider detection for openAI endpoints

* wip: add audio support to openrouter

* fix: filetypes now properly parsed and sent rather than destructured mimetypes for openrouter

* refactor: Omit to Exclude for ESLint

* feat: update DragDropModal for new openrouter support

* fix: special case openrouter for lower case provider

(currently getting issues with the provider coming in as 'OpenRouter' and our enum being 'openrouter') This will probably require a larger refactor later to handle case insensitivity for all providers, but that will have to be thoroughly tested in its own isolated PR

---------

Co-authored-by: Claude Sonnet 4.5 <noreply@anthropic.com>
Co-authored-by: Dustin Healy <54083382+dustinhealy@users.noreply.github.com>

packages/api/src/files/encode/audio.ts

@@ -79,6 +79,21 @@ export async function encodeAndFormatAudios(
         mimeType: file.type,
         data: content,
       });
+    } else if (provider === Providers.OPENROUTER) {
+      // Extract format from filename extension (e.g., 'audio.mp3' -> 'mp3')
+      // OpenRouter expects format values like: wav, mp3, aiff, aac, ogg, flac, m4a, pcm16, pcm24
+      // Note: MIME types don't always match (e.g., 'audio/mpeg' is mp3, not mpeg), so that is why we are using the file extension instead
+      const format = file.filename.split('.').pop()?.toLowerCase();
+      if (!format) {
+        throw new Error(`Could not extract audio format from filename: ${file.filename}`);
+      }
+      result.audios.push({
+        type: 'input_audio',
+        input_audio: {
+          data: content,
+          format,
+        },
+      });
     }
 
     result.files.push(metadata);