feat: init Go module with config and in-memory note store

internal/store/models.go

@@ -0,0 +1,25 @@
+package store
+
+import "time"
+
+type Note struct {
+	ID        string    `json:"id"`
+	Title     string    `json:"title"`
+	Content   string    `json:"content"`
+	Tags      []string  `json:"tags"`
+	FilePath  string    `json:"file_path"`
+	CreatedAt time.Time `json:"created_at"`
+	UpdatedAt time.Time `json:"updated_at"`
+}
+
+type Chunk struct {
+	NoteID    string
+	Index     int
+	Content   string
+	Embedding []float64
+}
+
+type SearchResult struct {
+	Note  *Note   `json:"note"`
+	Score float64 `json:"score"`
+}