feat: initial implementation of go-kite

Core framework:
- Kite router with full HTTP method support (GET, POST, PUT, DELETE, HEAD, OPTIONS, CONNECT, TRACE)
- Nestable route groups with prefix and middleware inheritance
- Global, group, and route-level middleware with onion ordering
- Centralized error, not-found, and method-not-allowed handlers
- Graceful shutdown on SIGTERM/SIGINT with configurable timeout
- Configurable server read, write, and idle timeouts
- Context with typed request/response helpers, value store, cookie, form, and body binding support
- Response writer wrapper for status code tracking

Middleware:
- Logger with configurable output, format, and skip function
- Recovery with configurable panic handler
- RequestID with configurable header and generator, forwards incoming IDs
- CORS with configurable origins, methods, headers, credentials, and max age
- MaxBodySize with configurable byte limit

Docs:
- README with quickstart, routing, middleware, context API reference, and TLS guide

middleware/request_id.go

@@ -0,0 +1,46 @@
+package middleware
+
+import (
+	"crypto/rand"
+	"fmt"
+
+	"git.trcreatives.at/trcreatives/go-kite"
+)
+
+type RequestIDConfig struct {
+	Header    string
+	Generator func() string
+}
+
+func RequestID() kite.Middleware {
+	return RequestIDWithConfig(RequestIDConfig{})
+}
+
+func RequestIDWithConfig(cfg RequestIDConfig) kite.Middleware {
+	if cfg.Header == "" {
+		cfg.Header = "X-Request-ID"
+	}
+
+	if cfg.Generator == nil {
+		cfg.Generator = func() string {
+			b := make([]byte, 16)
+			rand.Read(b)
+			return fmt.Sprintf("%08x-%04x-%04x-%04x-%012x",
+				b[0:4], b[4:6], b[6:8], b[8:10], b[10:16])
+		}
+	}
+
+	return func(h kite.Handler) kite.Handler {
+		return func(ctx *kite.Context) error {
+			id := ctx.GetHeader(cfg.Header)
+			if id == "" {
+				id = cfg.Generator()
+			}
+
+			ctx.SetHeader(cfg.Header, id)
+			ctx.SetValue(cfg.Header, id)
+
+			return h(ctx)
+		}
+	}
+}