fix[frontend](ngnx): integrations page default to /index.html

[AlexSanchez-bit]

No description provided.

[github-actions]

🛑 AI review — Blocking issues

One or more high/critical issues can break things and must be fixed before merging. Details below.

✅ architecture (gemini-3-flash-lite) — clean

Summary: Minor Nginx configuration adjustment for frontend routing; no architectural impact.

No findings.

🛑 bugs (gemini-3-flash-lite) — blocking — must fix before merge

Summary: Removal of $uri/ from try_files will break directory-based routing for integrations.

• high frontend/nginx/default.conf:23 — Removing '$uri/' from try_files prevents Nginx from serving index.html files located in subdirectories (e.g., /integrations/slack/index.html). This will cause 404 errors for any integration route that relies on directory-based path resolution.

⚠️ security (gemini-3-flash-lite) — non-blocking warnings

Summary: Potential path traversal or resource access issue due to removal of directory fallback in nginx configuration.

• medium frontend/nginx/default.conf:23 — Removing '$uri/' from try_files prevents nginx from automatically serving index files within subdirectories of /integrations/. While this may be intended to restrict access, it can lead to unexpected 404 errors or potential misconfiguration if the frontend expects directory-based routing. Ensure this change does not inadvertently expose or hide sensitive static assets.

[utmstackprapprover]

Changes requested — AI review found blocking issues (high/critical, or engineer review required). See above.