feat: add health checks, OG image generation, and R2 integration

- Implement health check system with caching and singleflight pattern
- Add OG image generation via Satori with R2 storage backend
- Configure Railway deployment with health check endpoint
- Add connection pooling and Unix socket support for Bun SSR
- Block external access to internal routes (/internal/*)

web/vite-plugin-json-logger.ts

@@ -55,7 +55,7 @@ export function jsonLogger(): Plugin {
           sinks: ["json"],
         },
         {
-          category: ["vite"],
+          category: [],
           lowestLevel: "debug",
           sinks: ["json"],
         },