build: migrate from npm to pnpm with workspace catalogs

- Switch package manager to pnpm 10 via corepack
- Add pnpm-workspace.yaml with 54+ shared dependency catalogs
- Convert all workspace packages to catalog: and workspace:* protocols
- Upgrade Turborepo from 1.x to 2.8.12 (pipeline -> tasks)
- Upgrade apps/openpage-api from Next 15 to Next 16
- Update Docker, CI workflows, and GitHub Actions for pnpm
- Convert patch file to pnpm native format
- Replace deprecated next lint with standalone eslint
- Update all documentation references from npm to pnpm
- Fix stale dependabot config and documentation paths

.github/actions/node-install/action.yml

@@ -1,4 +1,4 @@
-name: 'Setup node and cache node_modules'
+name: 'Setup node and install dependencies with pnpm'
 inputs:
   node_version:
     required: false
@@ -7,33 +7,19 @@ inputs:
 runs:
   using: 'composite'
   steps:
+    - name: Install pnpm
+      uses: pnpm/action-setup@v4
+
     - name: Set up Node ${{ inputs.node_version }}
       uses: actions/setup-node@v4
       with:
         node-version: ${{ inputs.node_version }}
-
-    - name: Cache npm
-      uses: actions/cache@v3
-      with:
-        path: ~/.npm
-        key: npm-${{ hashFiles('package-lock.json') }}
-        restore-keys: npm-
-
-    - name: Cache node_modules
-      uses: actions/cache@v3
-      id: cache-node-modules
-      with:
-        path: |
-          node_modules
-          packages/*/node_modules
-          apps/*/node_modules
-        key: modules-${{ hashFiles('package-lock.json') }}
+        cache: 'pnpm'
 
     - name: Install dependencies
-      if: steps.cache-node-modules.outputs.cache-hit != 'true'
       shell: bash
       run: |
-        npm ci --no-audit
-        npm run prisma:generate
+        pnpm install --frozen-lockfile
+        pnpm run prisma:generate
       env:
         HUSKY: '0'