feat: implement user profiles with achievements and primary badge system (#58)

## Summary

This PR implements comprehensive user profile enhancements including:
- User profile pages showing stats, badges, social links, and bio
- Achievement system with 62 achievements across 5 categories
- Primary badge selection allowing users to display their preferred badge
- Admin profile editing capabilities

## Changes

### User Profiles (#45)
- **Frontend**: User profile pages with stats display
  - Profile cards showing avatar, display name, username, and bio
  - Social links section (Website, GitHub, Bluesky, LinkedIn, Twitch, YouTube, Discord)
  - Stats display (suggestions, accepted suggestions, likes, comments)
  - Recent achievements section
  - Badge display
  - Report button for other users' profiles
- **Backend**: Profile API endpoints
  - Get user profile by username or ID
  - Profile includes stats, badges, and achievement points

### Achievement System (#48)
- **Database**: UserAchievement model for tracking progress
- **62 Total Achievements** across 5 categories:
  - **Suggestions (15)**: First suggestion through ultimate curator
  - **Likes (12)**: First like through legendary fan
  - **Comments (12)**: First comment through review legend
  - **Engagement (15)**: Login streaks and activity milestones
  - **Reports (8)**: Valid reports and accuracy tracking
- **Backend**: AchievementService with real-time checking
  - Integrated into all user interaction points
  - API endpoints for achievement data
  - Progress tracking to avoid recalculation
- **Frontend**: Achievements page and profile integration
  - Full achievements page with category filtering
  - Tier-based styling (Bronze, Silver, Gold, Platinum, Diamond)
  - Progress indicators for in-progress achievements
  - Recent achievements on profile pages

### Primary Badge System (#49)
- **Database**: Add primaryBadge field to User model
- **Backend**: Update profile endpoints to include primary badge
- **Frontend**: Primary badge selection in settings
  - Only shows badges the user has earned
  - Displayed on profile page
  - Displayed in comments (next to username)
  - Falls back to no badge if selection is invalid
- **Admin Features**: Admin can edit any user's primary badge

### Admin Enhancements
- Comprehensive profile editing modal for admins
  - Edit display name, bio, slug, social links
  - Set primary badge for users
  - Visual feedback for save/error states
- Admin action buttons in report review modals
  - Ban user, delete comment, edit profile
  - Integrated with report workflow

### Quality Improvements
- Improved dropdown option contrast for readability
- Hide all badges when no primary badge is selected
- "View All" achievements link only shown on own profile
- Improved achievement text readability

## Testing

- ✅ User profiles display correctly with stats and badges
- ✅ Achievement checking works for all interaction types
- ✅ Primary badge selection persists and displays correctly
- ✅ Admin profile editing saves successfully
- ✅ Report workflow integrated with admin actions
- ✅ Achievements page shows all 62 achievements with filtering
- ✅ Text readability improved across components

Closes #45
Closes #48
Closes #49

Co-authored-by: Hikari <hikari@nhcarrigan.com>
Reviewed-on: #58
Co-authored-by: Naomi Carrigan <commits@nhcarrigan.com>
Co-committed-by: Naomi Carrigan <commits@nhcarrigan.com>

apps/frontend/src/app/app.routes.ts

@@ -41,6 +41,10 @@ export const appRoutes: Route[] = [
     path: 'admin/suggestions',
     loadComponent: () => import('./components/admin/admin-suggestions.component').then(m => m.AdminSuggestionsComponent)
   },
+  {
+    path: 'admin/reports',
+    loadComponent: () => import('./components/admin-reports/admin-reports.component').then(m => m.AdminReportsComponent)
+  },
   {
     path: 'my-suggestions',
     loadComponent: () => import('./components/my-suggestions/my-suggestions.component').then(m => m.MySuggestionsComponent)
@@ -49,6 +53,18 @@ export const appRoutes: Route[] = [
     path: 'my-likes',
     loadComponent: () => import('./components/my-likes/my-likes.component').then(m => m.MyLikesComponent)
   },
+  {
+    path: 'profile/:identifier',
+    loadComponent: () => import('./components/profile/profile.component').then(m => m.ProfileComponent)
+  },
+  {
+    path: 'settings',
+    loadComponent: () => import('./components/settings/settings.component').then(m => m.SettingsComponent)
+  },
+  {
+    path: 'achievements',
+    loadComponent: () => import('./components/achievements/achievements.component').then(m => m.AchievementsComponent)
+  },
   {
     path: '**',
     redirectTo: ''