feat(leann-phase2): implement hybrid vector storage and graph-based search

- [x] Add AST-aware code chunking for Go, Python, and TypeScript using tree-sitter
- [x] Implement LEANN-inspired hybrid vector storage with hub detection and selective embedding storage (60-80% savings)
- [x] Add observation relationship graph with CSR format and edge detection (file overlap, semantic similarity, temporal, concept)
- [x] Implement graph-aware search with two-level traversal and relationship-based ranking
- [x] Add auto-tuning system for dynamic hub threshold adjustment based on query performance
- [x] Add comprehensive metrics tracking for vector storage, queries, latency, and graph traversals
- [x] Update configuration system with graph and hybrid storage settings
- [x] Add graph stats and vector metrics endpoints to worker service
- [x] Enhance UI sidebar with advanced metrics display and graph visualization
- [x] Optimize struct field alignment throughout codebase for memory efficiency
- [x] Update documentation with LEANN Phase 2 features and performance benefits
- [x] Add tree-sitter dependency for AST parsing

pkg/hooks/response.go

@@ -62,11 +62,11 @@ type BaseInput struct {
 // HookContext provides common context for hook handlers.
 type HookContext struct {
 	HookName  string
-	Port      int
 	Project   string
 	SessionID string
 	CWD       string
 	RawInput  []byte
+	Port      int
 }
 
 // HookHandler is a function that handles hook-specific logic.

pkg/hooks/worker_test.go

@@ -320,11 +320,11 @@ func TestExtractBaseVersion(t *testing.T) {
 // TestPOST tests the POST function with a mock server.
 func TestPOST(t *testing.T) {
 	tests := []struct {
-		name           string
-		serverHandler  func(w http.ResponseWriter, r *http.Request)
 		body           interface{}
-		expectError    bool
+		serverHandler  func(w http.ResponseWriter, r *http.Request)
 		expectedResult map[string]interface{}
+		name           string
+		expectError    bool
 	}{
 		{
 			name: "successful POST with JSON response",
@@ -393,10 +393,10 @@ func TestPOST(t *testing.T) {
 // TestGET tests the GET function with a mock server.
 func TestGET(t *testing.T) {
 	tests := []struct {
-		name           string
 		serverHandler  func(w http.ResponseWriter, r *http.Request)
-		expectError    bool
 		expectedResult map[string]interface{}
+		name           string
+		expectError    bool
 	}{
 		{
 			name: "successful GET with JSON response",
@@ -532,8 +532,8 @@ func TestExitCodes(t *testing.T) {
 func TestHookResponse(t *testing.T) {
 	tests := []struct {
 		name     string
-		response HookResponse
 		expected string
+		response HookResponse
 	}{
 		{
 			name:     "continue true",
@@ -597,8 +597,8 @@ func TestHookContext(t *testing.T) {
 // TestIsWorkerRunning_WithServer tests IsWorkerRunning with actual server.
 func TestIsWorkerRunning_WithServer(t *testing.T) {
 	tests := []struct {
-		name           string
 		serverHandler  func(w http.ResponseWriter, r *http.Request)
+		name           string
 		expectedResult bool
 	}{
 		{
@@ -828,8 +828,8 @@ func TestBaseInput_PartialFields(t *testing.T) {
 func TestHookResponse_Marshal(t *testing.T) {
 	tests := []struct {
 		name     string
-		response HookResponse
 		contains []string
+		response HookResponse
 	}{
 		{
 			name:     "continue true",