feat: add tenant and user management with migrations, handlers, and tests

- Implemented tenant and user management features including:
  - Tenant creation and management with associated migrations.
  - User creation and management with associated migrations.
  - Tenant membership management with associated migrations.
  - Platform user roles management with associated migrations.
  - Quota management with associated migrations.
  - Article and template management with associated migrations.
- Added HTTP handlers for templates and workspaces.
- Created tests for protected and public routes.
- Introduced a script to check tenant scope in SQL queries.
- Documented task plan for backend completion and frontend foundation.

server/internal/shared/middleware/request_id_test.go

@@ -0,0 +1,43 @@
+package middleware
+
+import (
+	"net/http"
+	"net/http/httptest"
+	"testing"
+
+	"github.com/gin-gonic/gin"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestRequestID_GeneratesNew(t *testing.T) {
+	r := gin.New()
+	r.Use(RequestID())
+	r.GET("/test", func(c *gin.Context) {
+		rid := RequestIDFromGin(c)
+		assert.NotEmpty(t, rid)
+		c.Status(http.StatusOK)
+	})
+
+	w := httptest.NewRecorder()
+	req := httptest.NewRequest(http.MethodGet, "/test", nil)
+	r.ServeHTTP(w, req)
+
+	assert.Equal(t, http.StatusOK, w.Code)
+	assert.NotEmpty(t, w.Header().Get(RequestIDHeader))
+}
+
+func TestRequestID_UsesExisting(t *testing.T) {
+	r := gin.New()
+	r.Use(RequestID())
+	r.GET("/test", func(c *gin.Context) {
+		c.Status(http.StatusOK)
+	})
+
+	w := httptest.NewRecorder()
+	req := httptest.NewRequest(http.MethodGet, "/test", nil)
+	req.Header.Set(RequestIDHeader, "my-custom-rid")
+	r.ServeHTTP(w, req)
+
+	assert.Equal(t, http.StatusOK, w.Code)
+	assert.Equal(t, "my-custom-rid", w.Header().Get(RequestIDHeader))
+}