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/max_body_size.go

@@ -0,0 +1,28 @@
+package middleware
+
+import (
+	"net/http"
+
+	"git.trcreatives.at/trcreatives/go-kite"
+)
+
+type MaxBodySizeConfig struct {
+	MaxBytes int64
+}
+
+func MaxBodySize(maxBytes int64) kite.Middleware {
+	return MaxBodySizeWithConfig(MaxBodySizeConfig{MaxBytes: maxBytes})
+}
+
+func MaxBodySizeWithConfig(cfg MaxBodySizeConfig) kite.Middleware {
+	if cfg.MaxBytes == 0 {
+		cfg.MaxBytes = 4 << 20
+	}
+
+	return func(h kite.Handler) kite.Handler {
+		return func(ctx *kite.Context) error {
+			ctx.GetRequest().Body = http.MaxBytesReader(ctx.GetResponse(), ctx.GetRequest().Body, cfg.MaxBytes)
+			return h(ctx)
+		}
+	}
+}