[Glense] Fix user ID types, add user tracking to chat, containerize video service, add comments API, remove hardcoded frontend data, improve UI

[Brankonymous]

Summary

• Video Catalogue: changed all user ID fields from int to Guid to match Account service (was a hard blocker for inter-service communication)
• Chat: added UserId (Guid) field to messages so we can track who sent what, populated from JWT claims
• Added Video Catalogue service to docker-compose.yml (port 5002)
• Fixed Chat service JWT secret to match Account service (tokens were being rejected)
• Fixed frontend video API port from 5088 to 5002
• Expanded seed data: 8 demo videos, 3 chat rooms with messages, sample donations between test users
• Deleted stale EF migrations for both Video and Chat (incompatible with schema changes, using EnsureCreated for dev)
• Added Comments feature to Video Catalogue service (model, controller, DTOs) with GET/POST/DELETE /api/videos/{videoId}/comments
• Removed all hardcoded mock data from constants.jsx (videos, comments, videoInfo, chats arrays) — all data now comes from APIs
• Moved all seed data (videos, comments, donations, users) into scripts/seed.sh so videos get real uploader IDs
• Renamed seed-test-users.sh to seed.sh since it now seeds everything
• Frontend components (VideoComments, ChannelDetail, VideoStream) now fetch from APIs instead of constants
• Colored letter avatars everywhere: navbar, chat sidebar, chat messages, video comments, video channel bar
• Fixed video API port 5088 → 5002 in frontend
• Fixed Upload page: dark theme styling, removed manual "Uploader ID" field
• Removed duplicate "Add to playlist" section from video page
• Removed ChatList widget from feed sidebar (chat is accessible via navbar)
• Video detail page fetches uploader profile to show real username

What was broken before

┌────────────────────────────────────────────────────┬──────────────────────────────────┐
│                      Problem                       │              Impact              │
├────────────────────────────────────────────────────┼──────────────────────────────────┤
│ Video service used int user IDs, Account uses Guid │ Cannot link videos to real users │
├────────────────────────────────────────────────────┼──────────────────────────────────┤
│ Chat messages had no user ID field                 │ Cannot show who sent a message   │
├────────────────────────────────────────────────────┼──────────────────────────────────┤
│ Chat JWT secret mismatched Account service         │ Auth tokens rejected by Chat     │
├────────────────────────────────────────────────────┼──────────────────────────────────┤
│ Video service not in docker-compose                │ Had to run manually              │
├────────────────────────────────────────────────────┼──────────────────────────────────┤
│ Frontend pointed to port 5088 for videos           │ Connection refused               │
└────────────────────────────────────────────────────┴──────────────────────────────────┘

Test plan

• docker compose up --build starts all 4 services + databases
• ./scripts/seed-test-users.sh creates users, wallets, and donations
• Video service health check: curl http://localhost:5002/health
• Chat service health check: curl http://localhost:5004/health
• GET /api/videos returns 8 seeded videos with Guid uploaderIds
• GET /api/chats returns 3 seeded chat rooms
• Frontend feed page shows video thumbnails
• Chat page shows chat rooms