feat: integrate Job Boardly RSS feed with authentication-protected job board (#833)

Add a complete job board integration that fetches jobs from Job Boardly's RSS feed and displays them behind authentication.

Features:
- RSS feed parser for Job Boardly jobs (title, company, location, type, salary, etc.)
- Protected job listing page (/jobs) - requires GitHub OAuth login
- Job detail page with full descriptions and apply links
- Search and filter functionality (by keyword, category, job type)
- VWC Alumni badge for users with course enrollments
- Links to resume translator and courses for job seekers
- API endpoint for fetching jobs programmatically
- Dev access bypass for local testing without OAuth setup

Navigation:
- Added "Jobs" link to main menu (with "new" badge)
- Added "Browse Jobs" to dashboard quick links

Technical Changes:
- Install rss-parser and xml2js packages
- Create jobboardly utility library in src/lib/
- Server-side rendering with authentication checks via NextAuth
- Fixed Next.js 15 webpack config compatibility issue (removed usedExports)
- Dev-only bypass mode for testing without GitHub OAuth credentials

Access Control:
- Production: Only Vets-Who-Code GitHub org members + admin
- Development: Any GitHub user (for testing)
- Job board pages redirect to /login if unauthenticated

Author: jeromehardaway

next.config.js

@@ -48,7 +48,7 @@ const nextConfig = {
             // Enable tree-shaking for server bundles
             config.optimization = {
                 ...config.optimization,
-                usedExports: true,
+                // Note: usedExports removed for Next.js 15 compatibility
                 sideEffects: false,
             };
         }