feat: Complete internationalization and code cleanup

## Translation Files
- Add 11 new language files (es, de, pt, ru, zh, ja, ko, ar, hi, nl, pl)
- Add 100+ missing translation keys across all 15 languages
- New sections: notebook, pagination, ai.batchOrganization, ai.autoLabels
- Update nav section with workspace, quickAccess, myLibrary keys

## Component Updates
- Update 15+ components to use translation keys instead of hardcoded text
- Components: notebook dialogs, sidebar, header, note-input, ghost-tags, etc.
- Replace 80+ hardcoded English/French strings with t() calls
- Ensure consistent UI across all supported languages

## Code Quality
- Remove 77+ console.log statements from codebase
- Clean up API routes, components, hooks, and services
- Keep only essential error handling (no debugging logs)

## UI/UX Improvements
- Update Keep logo to yellow post-it style (from-yellow-400 to-amber-500)
- Change selection colors to #FEF3C6 (notebooks) and #EFB162 (nav items)
- Make "+" button permanently visible in notebooks section
- Fix grammar and syntax errors in multiple components

## Bug Fixes
- Fix JSON syntax errors in it.json, nl.json, pl.json, zh.json
- Fix syntax errors in notebook-suggestion-toast.tsx
- Fix syntax errors in use-auto-tagging.ts
- Fix syntax errors in paragraph-refactor.service.ts
- Fix duplicate "fusion" section in nl.json

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Ou une version plus courte si vous préférez :

feat(i18n): Add 15 languages, remove logs, update UI components

- Create 11 new translation files (es, de, pt, ru, zh, ja, ko, ar, hi, nl, pl)
- Add 100+ translation keys: notebook, pagination, AI features
- Update 15+ components to use translations (80+ strings)
- Remove 77+ console.log statements from codebase
- Fix JSON syntax errors in 4 translation files
- Fix component syntax errors (toast, hooks, services)
- Update logo to yellow post-it style
- Change selection colors (#FEF3C6, #EFB162)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

keep-notes/lib/types.ts

@@ -4,13 +4,36 @@ export interface CheckItem {
   checked: boolean;
 }
 
+/**
+ * Notebook model for organizing notes
+ */
+export interface Notebook {
+  id: string;
+  name: string;
+  icon: string | null;
+  color: string | null;
+  order: number;
+  userId: string;
+  createdAt: Date;
+  updatedAt: Date;
+  // Relations
+  notes?: Note[];
+  labels?: Label[];
+}
+
+/**
+ * Label model - contextual to notebooks
+ */
 export interface Label {
   id: string;
   name: string;
   color: LabelColorName;
-  userId?: string | null;
+  notebookId: string | null; // NEW: Belongs to a notebook
+  userId?: string | null; // DEPRECATED: Kept for backward compatibility
   createdAt: Date;
   updatedAt: Date;
+  // Relations
+  notebook?: Notebook | null;
 }
 
 export interface LinkMetadata {
@@ -30,7 +53,7 @@ export interface Note {
   isArchived: boolean;
   type: 'text' | 'checklist';
   checkItems: CheckItem[] | null;
-  labels: string[] | null;
+  labels: string[] | null; // DEPRECATED: Array of label names stored as JSON string
   images: string[] | null;
   links: LinkMetadata[] | null;
   reminder: Date | null;
@@ -44,6 +67,13 @@ export interface Note {
   embedding?: number[] | null;
   sharedWith?: string[];
   userId?: string | null;
+  // NEW: Notebook relation (optional - null = "Notes générales" / Inbox)
+  notebookId?: string | null;
+  notebook?: Notebook | null;
+  autoGenerated?: boolean | null;
+  // Search result metadata (optional)
+  matchType?: 'exact' | 'related' | null;
+  searchScore?: number | null;
 }
 
 export type NoteSize = 'small' | 'medium' | 'large';