fun: HTTP RPC framework with DI, guards, streams and codegen

- Service binding via reflection with 4 method signatures
- Dependency injection (Wired/auto tags) and guards
- Streamable HTTP (NDJSON) streaming responses
- Go/TypeScript client code generation (self-contained, with interceptors)
- Enum support, structured Result, logging
- 16 regression tests covering all fixed bugs

go.mod

@@ -0,0 +1,11 @@
+module github.com/cyi-cc/fun
+
+go 1.26.1
+
+require github.com/valyala/fasthttp v1.73.0
+
+require (
+	github.com/andybalholm/brotli v1.2.2 // indirect
+	github.com/klauspost/compress v1.19.1 // indirect
+	github.com/valyala/bytebufferpool v1.0.0 // indirect
+)