feat: add pricing sync script and update model prices from OpenRouter (#27)

* fix: pin npm package versions in MCP integration templates

Prevent supply chain attacks by pinning exact versions instead of
using unpinned `npx -y @package` which pulls latest on every run.

23 of 25 integrations pinned. sqlite-mcp and aws skipped (packages
not found on npm registry).

* fix: use stable azure/mcp version instead of beta

* feat: add pricing sync script and update model prices from OpenRouter API

- scripts/sync-pricing.py fetches real-time pricing from OpenRouter
- Updated 64 price fields across 13 provider files
- Run periodically or in CI to keep prices current

.github/workflows/sync-pricing.yml

@@ -0,0 +1,42 @@
+name: Sync Model Pricing
+
+on:
+  schedule:
+    # Run daily at 06:00 UTC
+    - cron: '0 6 * * *'
+  workflow_dispatch: # Allow manual trigger
+
+permissions:
+  contents: write
+  pull-requests: write
+
+jobs:
+  sync-pricing:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-python@v5
+        with:
+          python-version: '3.12'
+
+      - name: Sync pricing from OpenRouter API
+        run: python scripts/sync-pricing.py --create-missing
+
+      - name: Check for changes
+        id: changes
+        run: |
+          git diff --quiet && echo "changed=false" >> "$GITHUB_OUTPUT" || echo "changed=true" >> "$GITHUB_OUTPUT"
+
+      - name: Create PR if prices changed
+        if: steps.changes.outputs.changed == 'true'
+        uses: peter-evans/create-pull-request@v7
+        with:
+          commit-message: "chore: sync model pricing from OpenRouter API"
+          title: "chore: sync model pricing from OpenRouter API"
+          body: |
+            Automated pricing sync from [OpenRouter API](https://openrouter.ai/api/v1/models).
+
+            Run by `sync-pricing.yml` cron job.
+          branch: chore/auto-sync-pricing
+          delete-branch: true