fix: full-stack E2E hardening — client blobs, modal errors, audit coverage, MCP context

- api-client: getResponseBody returns Blob for non-JSON (fixes storage
  preview/download TypeError); postgen.mjs reapplies the patch on regen
- Modal: error prop renders inside the dialog so request failures are
  visible instead of hidden behind the overlay (6 pages wired)
- lib/api: extract server-provided error message from error.body
- Modal: unique id per instance (duplicate modal-title broke aria-label)
- nginx: index.html no-cache + immutable /assets (stale shell pointed at
  deleted hashed assets after redeploy → white screen)
- vite: drop dead Google Fonts runtime caching (fonts are vendored)
- functions: audit function.created/updated/deleted/invoked
- AuditPage: expand action filter to all recorded actions
- MCP: whoami uses /context for API keys; projectId/orgId resolve via
  /context with auth-aware precedence (stale `primora use` selection can
  never authorize a differently-scoped key)

Generated with [Devin](https://devin.ai)

Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

apps/frontend/Dockerfile

@@ -27,13 +27,20 @@ RUN npm run build
 # Stage 2: Serve with Nginx
 FROM nginx:1.27-alpine
 COPY --from=builder /app/apps/frontend/dist /usr/share/nginx/html
-# Add simple nginx config for SPA routing
+# Add simple nginx config for SPA routing. index.html must always revalidate —
+# it references hashed assets that change every deploy. Hashed /assets files are
+# immutable and safe to cache long-term.
 RUN echo 'server { \
     listen 80; \
+    root /usr/share/nginx/html; \
+    index index.html; \
+    location /assets/ { \
+        try_files $uri =404; \
+        add_header Cache-Control "public, max-age=31536000, immutable"; \
+    } \
     location / { \
-        root /usr/share/nginx/html; \
-        index index.html; \
         try_files $uri $uri/ /index.html; \
+        add_header Cache-Control "no-cache, must-revalidate"; \
     } \
 }' > /etc/nginx/conf.d/default.conf