ci: Add slim Dockerfile.ci files for faster CI builds

- Add Dockerfile.ci for backend, cannaiq, findadispo, findagram
- Frontend Dockerfiles just copy pre-built assets to nginx
- Backend Dockerfile copies pre-built dist/node_modules
- Reduces Docker build time by doing npm ci/build in CI step

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

findagram/frontend/Dockerfile.ci

@@ -0,0 +1,25 @@
+# CI Dockerfile - assets pre-built in CI step
+FROM nginx:alpine
+
+# Copy pre-built assets from CI (CRA builds to /build)
+COPY findagram/frontend/build /usr/share/nginx/html
+
+# SPA routing config
+RUN echo 'server { \
+    listen 80; \
+    server_name _; \
+    root /usr/share/nginx/html; \
+    index index.html; \
+    gzip on; \
+    gzip_types text/plain text/css application/json application/javascript text/xml application/xml application/xml+rss text/javascript; \
+    location ~* \.(js|css|png|jpg|jpeg|gif|ico|svg|woff|woff2|ttf|eot)$ { \
+        expires 1y; \
+        add_header Cache-Control "public, immutable"; \
+    } \
+    location / { \
+        try_files $uri $uri/ /index.html; \
+    } \
+}' > /etc/nginx/conf.d/default.conf
+
+EXPOSE 80
+CMD ["nginx", "-g", "daemon off;"]