docs: add complete guide, env files, fix docker-compose

- Add GUIDE.md: complete user documentation covering installation,
  Docker deployment, AI providers, MCP server, N8N integration,
  email config, admin panel, env var reference, troubleshooting
- Add mcp-server/.env.example with all MCP-specific variables
- Update .env.docker.example with all 42 environment variables
- Fix docker-compose.yml: parameterize PostgreSQL credentials,
  add missing env vars (CUSTOM_OPENAI, AI_PROVIDER_CHAT,
  ALLOW_REGISTRATION, RESEND_API_KEY)
- Track memento-note/.env.example

memento-note/hooks/use-title-suggestions.ts

@@ -17,7 +17,7 @@ export function useTitleSuggestions({ content, enabled = true }: UseTitleSuggest
   const [isAnalyzing, setIsAnalyzing] = useState(false)
   const [error, setError] = useState<string | null>(null)
 
-  // Debounce le contenu de 2s pour éviter trop d'appels
+  // Debounce content by 2s to avoid excessive API calls
   const debouncedContent = useDebounce(content, 2000)
 
   useEffect(() => {
@@ -28,7 +28,7 @@ export function useTitleSuggestions({ content, enabled = true }: UseTitleSuggest
 
     const wordCount = debouncedContent.split(/\s+/).length
 
-    // Il faut au moins 10 mots
+    // Need at least 10 words
     if (wordCount < 10) {
       setSuggestions([])
       return
@@ -49,14 +49,14 @@ export function useTitleSuggestions({ content, enabled = true }: UseTitleSuggest
 
         if (!response.ok) {
           const errorData = await response.json()
-          throw new Error(errorData.error || 'Erreur lors de la génération des titres')
+          throw new Error(errorData.error || 'Error generating title suggestions')
         }
 
         const data = await response.json()
         setSuggestions(data.suggestions || [])
       } catch (err) {
         console.error('❌ Title suggestions error:', err)
-        setError('Impossible de générer des suggestions de titres')
+        setError('Failed to generate title suggestions')
       } finally {
         setIsAnalyzing(false)
       }