🔒️(backend) secure native app OIDC login with exchange codes

Add one-time exchange code mechanism for native app OIDC login.
Instead of exposing session ID in redirect URL, generates a
short-lived single-use code stored in Redis. Native apps exchange
this code for the session ID via a dedicated API endpoint.

Includes NativeAppRedirect for custom URL schemes, rate limiting,
logging, and whitelist of allowed schemes.

Closes #1153

Co-Authored-By: gigi206

.github/workflows/meet.yml

@@ -297,46 +297,6 @@ jobs:
       - name: Run tests
         run: uv run pytest -n 2
 
-  test-summary:
-    runs-on: ubuntu-latest
-    permissions:
-      contents: read
-    defaults:
-      run:
-        working-directory: src/summary
-
-    env:
-      APP_API_TOKEN: "test-api-token"
-      AWS_STORAGE_BUCKET_NAME: "http://meet-media-storage"
-      AWS_S3_ENDPOINT_URL: "minio:9000"
-      AWS_S3_ACCESS_KEY_ID: "meet"
-      AWS_S3_SECRET_ACCESS_KEY: "password"
-      WHISPERX_BASE_URL: "https://configure-your-url.com"
-      WHISPERX_ASR_MODEL: "large-v2"
-      WHISPERX_API_KEY: "test-whisperx-secret"
-      WHISPERX_DEFAULT_LANGUAGE: "fr"
-      LLM_BASE_URL: "https://configure-your-url.com"
-      LLM_API_KEY: "test-llm-secret"
-      LLM_MODEL: "test-llm-model"
-      WEBHOOK_API_TOKEN: "test-webhook-secret"
-      WEBHOOK_URL: "https://configure-your-url.com"
-
-    steps:
-      - name: Checkout repository
-        uses: actions/checkout@v6
-
-      - name: Install Python
-        uses: actions/setup-python@v6
-        with:
-          python-version: "3.13"
-          cache: "pip"
-
-      - name: Install development dependencies
-        run: pip install --user .[dev]
-
-      - name: Run summary tests
-        run: ~/.local/bin/pytest
-
   lint-front:
     runs-on: ubuntu-latest
     permissions: