docs: update reader implementation plan with dockable panels

- Add modular dockable panel architecture with:
  - Panel dock system (drag, lock, snap-back, window-shade)
  - TOC, Settings, Navigator, Bookmarks as dockable components
  - Lock toggle to prevent accidental moves
  - Snap-back to last valid position if dropped in invalid area
  - Per-user layout stored in reader_settings JSONB

- Update TypeScript types with PanelLayoutSettings and PanelState
- Add panel-dock-system.ts implementation to plan
- Add navigator-panel.ts for Affinity-style page navigation
- Update reader template with dockable panels and lock buttons

- Add Section 2.4 with database/Go implementation issues and fixes
- Document schema changes (DECIMAL -> REAL)
- Document all type fixes needed in reader.go

internal/router/router.go

@@ -64,6 +64,7 @@ type Config struct {
 	ScannerHandler        *handlers.Handler
 	JobsHandler           *handlers.JobsHandler
 	SidecarHandler        *handlers.SidecarHandler
+	ReaderHandler         *handlers.ReaderHandler
 }
 
 // createJWTMiddleware creates a JWT middleware with proper user context setup
@@ -218,6 +219,7 @@ func RegisterRoutes(cfg *Config) *handlers.Handler {
 	registerJobRoutes(cfg)
 	registerFiltersRoutes(cfg)
 	registerOPDSRoutes(cfg)
+	registerReaderRoutes(cfg)
 	registerWebSocketRoutes(cfg)
 	registerFrontendRoutes(cfg)
 	registerDocumentationRoutes(cfg)