Update code references and tests: Bookmann → Bookhoard

Code changes:
- main.go: Update cache directory path
- sidecar.go: Update file extension (.bookmann.json → .bookhoard.json)
- security.go: Update CORS example URLs
- queue_test.go: Update test database name
- feed_test.go: Update test assertions
- phase1_integration_test.go: Update test email addresses
- TEST_COVERAGE.md: Update project references

Part of project rename to Bookhoard.

internal/handlers/sidecar.go

@@ -187,7 +187,7 @@ func (h *SidecarHandler) GetSidecarConfig(c echo.Context) error {
 	return c.JSON(http.StatusOK, config)
 }
 
-// DownloadSidecarConfig generates a .bookmann.json file for device setup
+// DownloadSidecarConfig generates a .bookhoard.json file for device setup
 // GET /api/devices/:device_id/sidecar/download
 func (h *SidecarHandler) DownloadSidecarConfig(c echo.Context) error {
 	deviceID, err := uuid.Parse(c.Param("device_id"))
@@ -324,7 +324,7 @@ func (h *SidecarHandler) DownloadSidecarConfig(c echo.Context) error {
 	}
 
 	// Set headers for file download
-	filename := fmt.Sprintf("%s.bookmann.json", sanitizeFilename(device.DeviceName))
+	filename := fmt.Sprintf("%s.bookhoard.json", sanitizeFilename(device.DeviceName))
 	c.Response().Header().Set("Content-Type", "application/json")
 	c.Response().Header().Set("Content-Disposition", fmt.Sprintf("attachment; filename=\"%s\"", filename))
 

internal/middleware/security.go

@@ -87,8 +87,8 @@ type CORSSecurityConfig struct {
 func NewSecureCORSConfig() CORSSecurityConfig {
 	return CORSSecurityConfig{
 		AllowedOrigins: []string{
-			"https://bookmann.example.com",
-			"https://*.bookmann.example.com",
+			"https://bookhoard.example.com",
+			"https://*.bookhoard.example.com",
 		},
 		AllowedMethods: []string{"GET", "POST", "PUT", "PATCH", "DELETE", "OPTIONS"},
 		AllowedHeaders: []string{

internal/opds/feed_test.go

@@ -121,7 +121,7 @@ func TestEntrySetIdentifier(t *testing.T) {
 	}
 
 	if entry.Identifier.ID != "bookhoard" {
-		t.Errorf("expected Identifier ID to be 'bookmann', got '%s'", entry.Identifier.ID)
+		t.Errorf("expected Identifier ID to be 'bookhoard', got '%s'", entry.Identifier.ID)
 	}
 
 	if entry.Identifier.Content != "book-uuid-123" {
@@ -139,7 +139,7 @@ func TestEntryAddMetadata(t *testing.T) {
 
 	meta := entry.Metadata[0]
 	if meta.Property != "bookhoard:sha256" {
-		t.Errorf("expected Property to be 'bookmann:sha256', got '%s'", meta.Property)
+		t.Errorf("expected Property to be 'bookhoard:sha256', got '%s'", meta.Property)
 	}
 
 	if meta.Content != "abc123..." {