[Glense][Infra] YARP Gateway integration

[Brankonymous]

🚀 Summary

• Infrastructure Rewrite: Replaced 8 manual proxy controllers (~2,500 LOC) with a YARP (Yet Another Reverse Proxy) config-driven implementation (~40 LOC + JSON config).
• Containerization: Fully containerized the Gateway with a Dockerfile and integrated it into docker-compose.
• Feature Parity & Beyond: Added active health checks, request timeouts, and native WebSocket/SignalR support.
• Video Enhancements: Fixed 500MB upload limits, implemented streaming (range requests), and added thumbnail support.
• Developer Experience: Introduced dev.sh for one-command environment setup (supporting Docker & Podman).

---

🛠️ What Changed

Gateway (Glense.Server)

• YARP Integration: Replaced all manual proxy logic with appsettings.json route configurations.
  • 13 routes across 4 clusters (Account, Video, Donation, Chat + SignalR).
• Resilience: * Active health checks polling /health every 10s per cluster.
  • 30s default request timeout (extended to 5min for video uploads).
• Security & Ops: * Runs as non-root user in Docker.
  • Environment-specific config via appsettings.Docker.json.
• Optimizations: .dockerignore added to exclude DonationService from build context.

Video Service Fixes

• Streaming: Fixed video range requests using PhysicalFile with enableRangeProcessing.
• Thumbnails: Added multipart form support for thumbnail uploads and a new /api/videos/{id}/thumbnail endpoint.
• Capacity: Raised Kestrel max request body limit to 500MB.

Frontend Fixes

• Upload Form: Requires thumbnail (16:9 validated), uses MUI buttons with preview.
• Video Components: VideoCard and VideoStream updated to resolve media through the gateway.

Dev Experience

• dev.sh: New script for start/stop/restart/logs/seed/prune with auto-detection for Docker/Podman.
• Cleanup: Script kills stale dotnet run processes blocking container ports.
• seed.sh: Routes through gateway, auto-detects DB containers.

---

📊 Architecture Comparison

Before vs. After

┌─────────────────────────┐         ┌─────────────────────────┐
│ 8 proxy controllers     │         │ Program.cs (~40 LOC)    │
│ ~2,500 lines of C#      │         │                         │
│ Manual route mapping    │   ──→   │ appsettings.json        │
│ Manual header forwarding│         │ (13 routes, 4 clusters) │
│ No WebSocket support    │         │ WebSocket: built-in     │
│ No health checks        │         │ Health checks: built-in │
│ No Docker support       │         │ Docker: containerized   │
└─────────────────────────┘         └─────────────────────────┘

   
          ┌─────────────────────────────────────────────────────────────┐
          │                 Frontend (React/Vite)                       │
          │                 http://localhost:3000                       │
          └──────────────────────────┬──────────────────────────────────┘
                                     │
                        All requests to http://localhost:5050
                                     │
                                     ▼
          ┌──────────────────────────────────────────────────────────────┐
          │                API Gateway (YARP) :5050                      │
          │                                                              │
          │  Route matching (appsettings.json):                          │
          │                                                              │
          │  /api/auth/** ──→  account-cluster  (:5001)          │
          │  /api/videos/** ──→  video-cluster    (:5002)          │
          │  /api/donation/** ──→  donation-cluster (:5100)          │
          │  /api/chats/** ──→  chat-cluster     (:5004)          │
          │  /hubs/chat           ──→  chat-cluster     (:5004) [WS]     │
          │                                                              │
          │  ┌────────────┐ ┌──────────┐ ┌───────────┐ ┌────────────┐    │
          │  │ Health     │ │  CORS    │ │ Timeouts  │ │  500MB     │    │
          │  │ checks/10s │ │ config   │ │ 30s/5min  │ │ upload     │    │
          │  └────────────┘ └──────────┘ └───────────┘ └────────────┘    │
          └──────┬──────────────┬──────────────┬──────────────┬──────────┘
                 │              │              │              │
                 ▼              ▼              ▼              ▼
          ┌────────────┐ ┌────────────┐ ┌────────────┐ ┌────────────┐
          │  Account   │ │   Video    │ │  Donation  │ │    Chat    │
          │   :5001    │ │   :5002    │ │   :5100    │ │   :5004    │
          └────────────┘ └────────────┘ └────────────┘ └────────────┘