plan/11: Add GET /api/version endpoint

Adds handlers/version.go returning hardcoded {"version":"0.1.0","name":"director","commit":"unknown"},
wires GET /api/version into main.go next to /api/health, and adds
handlers/version_test.go using httptest (no DB dependency).

Co-Authored-By: director-agent <director-agent@dragonchain.com>

api/handlers/version.go

@@ -0,0 +1,17 @@
+package handlers
+
+import "github.com/gin-gonic/gin"
+
+type VersionResponse struct {
+	Version string `json:"version"`
+	Name    string `json:"name"`
+	Commit  string `json:"commit"`
+}
+
+func (h *Handler) GetVersion(c *gin.Context) {
+	c.JSON(200, VersionResponse{
+		Version: "0.1.0",
+		Name:    "director",
+		Commit:  "unknown",
+	})
+}

api/handlers/version_test.go

@@ -0,0 +1,35 @@
+package handlers
+
+import (
+	"encoding/json"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+
+	"github.com/gin-gonic/gin"
+)
+
+func TestGetVersion(t *testing.T) {
+	gin.SetMode(gin.TestMode)
+	w := httptest.NewRecorder()
+	c, _ := gin.CreateTestContext(w)
+	c.Request = httptest.NewRequest("GET", "/api/version", nil)
+
+	h := &Handler{db: nil, ps: nil}
+	h.GetVersion(c)
+
+	if w.Code != http.StatusOK {
+		t.Errorf("expected 200, got %d", w.Code)
+	}
+
+	var body map[string]any
+	if err := json.Unmarshal(w.Body.Bytes(), &body); err != nil {
+		t.Fatalf("invalid json: %v", err)
+	}
+
+	for _, field := range []string{"version", "name", "commit"} {
+		if _, ok := body[field]; !ok {
+			t.Errorf("missing field: %s", field)
+		}
+	}
+}

api/main.go

@@ -98,6 +98,9 @@ func main() {
 
 		// Stats
 		api.GET("/stats", h.GetStats)
+
+		// Version
+		api.GET("/version", h.GetVersion)
 	}
 
 	// WebSocket