ci: add GitHub Action to auto-generate OpenAPI SDK types

Adds workflow that triggers on server code changes to:
- Export OpenAPI spec from NestJS Swagger module
- Generate TypeScript types with openapi-typescript
- Build the SDK package
- Create PR with changes if any exist

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.github/workflows/generate-openapi.yml

@@ -0,0 +1,83 @@
+name: Generate OpenAPI SDK Types
+
+on:
+  push:
+    branches:
+      - main
+      - develop
+    paths:
+      - 'packages/server/src/**/*.ts'
+      - 'packages/server/src/**/*.dto.ts'
+      - '!packages/server/src/**/*.spec.ts'
+      - '!packages/server/src/**/*.test.ts'
+  workflow_dispatch:
+
+defaults:
+  run:
+    shell: 'bash'
+
+jobs:
+  generate-openapi:
+    name: Generate OpenAPI and SDK Types
+    runs-on: ubuntu-latest
+    timeout-minutes: 15
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+          token: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Install pnpm
+        uses: pnpm/action-setup@v4
+        with:
+          version: 9
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '18'
+          cache: 'pnpm'
+
+      - name: Install dependencies
+        run: pnpm install --frozen-lockfile
+
+      - name: Generate OpenAPI spec and SDK types
+        run: pnpm run generate:sdk-types
+
+      - name: Check for changes
+        id: check-changes
+        run: |
+          if git diff --quiet shared/sdk-ts/; then
+            echo "has_changes=false" >> $GITHUB_OUTPUT
+          else
+            echo "has_changes=true" >> $GITHUB_OUTPUT
+          fi
+
+      - name: Create Pull Request
+        if: steps.check-changes.outputs.has_changes == 'true'
+        uses: peter-evans/create-pull-request@v6
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          commit-message: 'chore(sdk): update OpenAPI spec and generated types'
+          title: 'chore(sdk): update OpenAPI spec and generated types'
+          body: |
+            ## Summary
+            Automated update of OpenAPI specification and generated TypeScript SDK types.
+
+            This PR was automatically generated by the `generate-openapi.yml` workflow due to server code changes.
+
+            ## Changes
+            - Updated `shared/sdk-ts/openapi.json`
+            - Regenerated `shared/sdk-ts/src/schema.ts`
+
+            ## Test plan
+            - [ ] Verify the generated types compile correctly
+            - [ ] Check that no breaking changes were introduced to the API types
+          branch: chore/update-openapi-sdk-types
+          base: ${{ github.ref_name }}
+          labels: |
+            automated
+            sdk
+          delete-branch: true