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

ctx.go

@@ -0,0 +1,86 @@
+package fun
+
+import (
+	"encoding/json"
+	"net"
+	"reflect"
+
+	"github.com/valyala/fasthttp"
+)
+
+// Ctx 请求上下文。
+// 命名持有 *fasthttp.RequestCtx（非嵌入），避免其方法集提升到服务上，
+// 辅助方法全部小写，保证服务方法集只含业务方法。
+type Ctx struct {
+	Ip          string
+	State       map[string]string
+	MethodName  string
+	ServiceName string
+	Data        *map[string]any
+	RequestCtx  *fasthttp.RequestCtx
+}
+
+var ctxType = reflect.TypeFor[Ctx]()
+
+func (c *Ctx) path() string                { return string(c.RequestCtx.Path()) }
+func (c *Ctx) isPost() bool                { return c.RequestCtx.IsPost() }
+func (c *Ctx) postBody() []byte            { return c.RequestCtx.PostBody() }
+func (c *Ctx) remoteIP() net.IP            { return c.RequestCtx.RemoteIP() }
+func (c *Ctx) setStatusCode(code int)      { c.RequestCtx.SetStatusCode(code) }
+func (c *Ctx) write(p []byte) (int, error) { return c.RequestCtx.Write(p) }
+
+// send 写回响应，嵌套对象键统一转小写（兼容 TS/大小写敏感客户端）
+func (c *Ctx) send(result Result[any]) {
+	data, err := json.Marshal(result)
+	if err != nil {
+		c.sendError(err)
+		return
+	}
+	raw, err := lowerKeysFromJSON(data)
+	if err != nil {
+		_, _ = c.write(data)
+		return
+	}
+	out, err := json.Marshal(raw)
+	if err != nil {
+		_, _ = c.write(data)
+		return
+	}
+	_, _ = c.write(out)
+}
+
+// lowerKeysFromJSON 解析 JSON 后递归把所有对象键转为首字母小写
+func lowerKeysFromJSON(data []byte) (any, error) {
+	var raw any
+	if err := json.Unmarshal(data, &raw); err != nil {
+		return nil, err
+	}
+	return lowerKeys(raw), nil
+}
+
+func lowerKeys(obj any) any {
+	switch v := obj.(type) {
+	case map[string]any:
+		m := make(map[string]any, len(v))
+		for k, val := range v {
+			m[firstLetterToLower(k)] = lowerKeys(val)
+		}
+		return m
+	case []any:
+		for i := range v {
+			v[i] = lowerKeys(v[i])
+		}
+		return v
+	}
+	return obj
+}
+
+// sendError 写回错误响应
+// 业务 Error() 构造的 Result[any] 原样透传保留 Code/Msg/Status，普通 error 包成错误响应
+func (c *Ctx) sendError(err error) {
+	if result, ok := err.(Result[any]); ok {
+		c.send(result)
+		return
+	}
+	c.send(callError(err))
+}