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/book_matching.go

@@ -9,7 +9,7 @@ import (
 
 	"github.com/google/uuid"
 	"github.com/jackc/pgx/v5/pgtype"
-	"github.com/labstack/echo/v4"
+	"github.com/labstack/echo/v5"
 )
 
 // Book matching service (added to Handler struct in scanner.go initialization)
@@ -40,7 +40,7 @@ func toFloat8(f float64) pgtype.Float8 {
 }
 
 // QueryBooks handles POST /api/sync/books/query
-func (h *Handler) QueryBooks(c echo.Context) error {
+func (h *Handler) QueryBooks(c *echo.Context) error {
 	matchingService := h.getMatchingService()
 
 	var req services.BookQueryRequest
@@ -61,7 +61,7 @@ func (h *Handler) QueryBooks(c echo.Context) error {
 }
 
 // LinkBook handles POST /api/sync/link-book
-func (h *Handler) LinkBook(c echo.Context) error {
+func (h *Handler) LinkBook(c *echo.Context) error {
 	matchingService := h.getMatchingService()
 
 	var req services.LinkBookRequest
@@ -101,7 +101,7 @@ func (h *Handler) LinkBook(c echo.Context) error {
 }
 
 // GetUnlinkedBooks handles GET /api/sync/unlinked-books
-func (h *Handler) GetUnlinkedBooks(c echo.Context) error {
+func (h *Handler) GetUnlinkedBooks(c *echo.Context) error {
 	matchingService := h.getMatchingService()
 
 	deviceIDStr := c.Param("deviceId")
@@ -126,7 +126,7 @@ func (h *Handler) GetUnlinkedBooks(c echo.Context) error {
 }
 
 // GetDeviceFileAliases handles GET /api/devices/:id/file-aliases
-func (h *Handler) GetDeviceFileAliases(c echo.Context) error {
+func (h *Handler) GetDeviceFileAliases(c *echo.Context) error {
 	deviceIDStr := c.Param("id")
 	deviceID, err := uuid.Parse(deviceIDStr)
 	if err != nil {
@@ -172,7 +172,7 @@ func (h *Handler) GetDeviceFileAliases(c echo.Context) error {
 }
 
 // BulkLinkBooks handles POST /api/sync/bulk-link-books
-func (h *Handler) BulkLinkBooks(c echo.Context) error {
+func (h *Handler) BulkLinkBooks(c *echo.Context) error {
 	ctx := c.Request().Context()
 
 	var req BulkLinkBooksRequest
@@ -250,7 +250,7 @@ func (h *Handler) BulkLinkBooks(c echo.Context) error {
 }
 
 // AutoLinkBooks handles POST /api/sync/auto-link-books
-func (h *Handler) AutoLinkBooks(c echo.Context) error {
+func (h *Handler) AutoLinkBooks(c *echo.Context) error {
 	ctx := c.Request().Context()
 	matchingService := h.getMatchingService()
 
@@ -326,7 +326,7 @@ func (h *Handler) AutoLinkBooks(c echo.Context) error {
 }
 
 // GetUnlinkedBookSuggestions handles GET /api/sync/unlinked-books/:id/suggestions
-func (h *Handler) GetUnlinkedBookSuggestions(c echo.Context) error {
+func (h *Handler) GetUnlinkedBookSuggestions(c *echo.Context) error {
 	ctx := c.Request().Context()
 	matchingService := h.getMatchingService()
 
@@ -366,7 +366,7 @@ func (h *Handler) GetUnlinkedBookSuggestions(c echo.Context) error {
 }
 
 // CreateDeviceFileAlias handles POST /api/devices/:id/file-aliases
-func (h *Handler) CreateDeviceFileAlias(c echo.Context) error {
+func (h *Handler) CreateDeviceFileAlias(c *echo.Context) error {
 	deviceIDStr := c.Param("id")
 	deviceID, err := uuid.Parse(deviceIDStr)
 	if err != nil {
@@ -421,7 +421,7 @@ func (h *Handler) CreateDeviceFileAlias(c echo.Context) error {
 }
 
 // UpdateDeviceFileAlias handles PUT /api/devices/:id/file-aliases/:aliasId
-func (h *Handler) UpdateDeviceFileAlias(c echo.Context) error {
+func (h *Handler) UpdateDeviceFileAlias(c *echo.Context) error {
 	aliasIDStr := c.Param("aliasId")
 	aliasID, err := uuid.Parse(aliasIDStr)
 	if err != nil {
@@ -488,7 +488,7 @@ func (h *Handler) UpdateDeviceFileAlias(c echo.Context) error {
 }
 
 // DeleteDeviceFileAlias handles DELETE /api/devices/:id/file-aliases/:aliasId
-func (h *Handler) DeleteDeviceFileAlias(c echo.Context) error {
+func (h *Handler) DeleteDeviceFileAlias(c *echo.Context) error {
 	aliasIDStr := c.Param("aliasId")
 	aliasID, err := uuid.Parse(aliasIDStr)
 	if err != nil {
@@ -510,7 +510,7 @@ func (h *Handler) DeleteDeviceFileAlias(c echo.Context) error {
 }
 
 // GetBookMatches handles GET /api/books/match
-func (h *Handler) GetBookMatches(c echo.Context) error {
+func (h *Handler) GetBookMatches(c *echo.Context) error {
 	matchingService := h.getMatchingService()
 
 	// Get query parameters