refactor(handlers): update all handlers for Echo v5 compatibility

Update all handler functions to use *echo.Context (pointer) instead of echo.Context (value) as required by Echo v5.

Changes across all handler files:
- analytics.go: Update handler signatures
- auth.go: Update authentication handler signatures
- book_matching.go: Update matching handler signatures
- collections.go: Update collection handler signatures
- collections_preview_test.go: Update test signatures
- commonhandlers.go: Update common handler signatures
- conflicts.go: Update conflict handler signatures
- context.go: Update context handler signatures
- dashboard.go: Update dashboard handler signatures
- devices.go: Update device handler signatures
- jobs.go: Update job handler signatures
- kobo.go: Update Kobo handler signatures
- koreader.go: Update Koreader handler signatures
- library.go: Update library handler signatures
- matching.go: Update matching handler signatures
- media.go: Update media handler signatures
- opds.go: Update OPDS handler signatures
- progress.go: Update progress handler signatures
- queue.go: Update queue handler signatures
- refresh_token.go: Update token handler signatures
- scanner.go: Update scanner handler signatures
- sidecar.go: Update sidecar handler signatures
- sync.go: Update sync handler signatures
- system_settings.go: Update settings handler signatures
- websocket.go: Update WebSocket handler signatures

All handlers now properly implement Echo v5's pointer-based context pattern.
This change is necessary for type safety and compatibility with Echo v5's
improved context handling and WebSocket support.

internal/handlers/opds.go

@@ -17,7 +17,7 @@ import (
 
 	"github.com/google/uuid"
 	"github.com/jackc/pgx/v5/pgtype"
-	"github.com/labstack/echo/v4"
+	"github.com/labstack/echo/v5"
 )
 
 type OPDSHandler struct {
@@ -39,7 +39,7 @@ func NewOPDSHandler(db *database.Queries, libraryService *services.LibraryServic
 }
 
 // Helper function to get base URLs from system config
-func (h *OPDSHandler) getBaseURLs(c echo.Context) (string, string, error) {
+func (h *OPDSHandler) getBaseURLs(c *echo.Context) (string, string, error) {
 	baseURL, err := h.db.GetSystemConfig(c.Request().Context(), "base_url")
 	if err != nil {
 		return "", "", fmt.Errorf("failed to get base_url from config: %w", err)
@@ -54,7 +54,7 @@ func (h *OPDSHandler) getBaseURLs(c echo.Context) (string, string, error) {
 }
 
 // GetDeviceCatalog returns the OPDS catalog feed for a device
-func (h *OPDSHandler) GetDeviceCatalog(c echo.Context) error {
+func (h *OPDSHandler) GetDeviceCatalog(c *echo.Context) error {
 	deviceID := c.Param("deviceId")
 
 	page := c.QueryParam("page")
@@ -218,7 +218,7 @@ func (h *OPDSHandler) GetDeviceCatalog(c echo.Context) error {
 }
 
 // SearchDeviceCatalog searches the OPDS catalog for a device
-func (h *OPDSHandler) SearchDeviceCatalog(c echo.Context) error {
+func (h *OPDSHandler) SearchDeviceCatalog(c *echo.Context) error {
 	deviceID := c.Param("deviceId")
 
 	query := c.QueryParam("q")
@@ -335,7 +335,7 @@ func (h *OPDSHandler) SearchDeviceCatalog(c echo.Context) error {
 }
 
 // DownloadBook downloads a book with optional format conversion
-func (h *OPDSHandler) DownloadBook(c echo.Context) error {
+func (h *OPDSHandler) DownloadBook(c *echo.Context) error {
 	deviceID := c.Param("deviceId")
 	bookID := c.Param("bookId")
 	format := c.QueryParam("format") // epub, kepub, pdf, cbz
@@ -488,7 +488,7 @@ func (h *OPDSHandler) DownloadBook(c echo.Context) error {
 }
 
 // GetCoverImage serves a book's cover image
-func (h *OPDSHandler) GetCoverImage(c echo.Context) error {
+func (h *OPDSHandler) GetCoverImage(c *echo.Context) error {
 	deviceID := c.Param("deviceId")
 	bookID := c.Param("bookId")
 
@@ -578,7 +578,7 @@ func (h *OPDSHandler) GetCoverImage(c echo.Context) error {
 }
 
 // GetDeviceNavigation returns the OPDS navigation feed for a device
-func (h *OPDSHandler) GetDeviceNavigation(c echo.Context) error {
+func (h *OPDSHandler) GetDeviceNavigation(c *echo.Context) error {
 	deviceID := c.Param("deviceId")
 
 	// Get base URLs
@@ -629,7 +629,7 @@ func (h *OPDSHandler) GetDeviceNavigation(c echo.Context) error {
 }
 
 // ListFormats lists available formats for a book
-func (h *OPDSHandler) ListFormats(c echo.Context) error {
+func (h *OPDSHandler) ListFormats(c *echo.Context) error {
 	deviceID := c.Param("deviceId")
 	bookID := c.Param("bookId")
 
@@ -755,7 +755,7 @@ func (h *OPDSHandler) ListFormats(c echo.Context) error {
 }
 
 // RegisterOPDS registers a device for OPDS access
-func (h *OPDSHandler) RegisterOPDS(c echo.Context) error {
+func (h *OPDSHandler) RegisterOPDS(c *echo.Context) error {
 	deviceID := c.Param("deviceId")
 
 	// Parse device ID