feat(todos): refonte formulaire + chips domaines + non-zoomable

- TodoForm : domaines en chips multi-select colorés, priorité en 3 boutons
  colorés (haute/moyenne/basse), date initialisée à aujourd'hui, description
  et URL toujours visibles, boutons photo et GPS
- TodosPage : suppression filtres domaine/priorité, tags colorés par domaine
  dans les lignes, userSelect:none, groupage multi-domaines
- todos.ts : ajout domains[], photo_path, gps_lat/lng dans les interfaces TS
- index.html : viewport maximum-scale=1.0, user-scalable=no

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/src/api/todos.ts

@@ -4,13 +4,16 @@ export interface Todo {
   title: string
   body: string | null
   url: string | null
-  domain: string | null
+  domains: string[]
   category: string | null
   tags: string[]
   status: 'pending' | 'done' | 'cancelled'
   priority: 'low' | 'medium' | 'high'
   due_date: string | null
   postponed_count: number
+  photo_path: string | null
+  gps_lat: number | null
+  gps_lng: number | null
   created_at: string
   updated_at: string | null
   owner_id: string | null
@@ -21,11 +24,15 @@ export interface TodoCreate {
   body?: string
   url?: string
   domain?: string
+  domains?: string[]
   category?: string
   tags?: string[]
   status?: 'pending' | 'done' | 'cancelled'
   priority?: 'low' | 'medium' | 'high'
   due_date?: string
+  photo_path?: string
+  gps_lat?: number
+  gps_lng?: number
 }
 
 export interface TodoUpdate {
@@ -33,11 +40,15 @@ export interface TodoUpdate {
   body?: string
   url?: string
   domain?: string
+  domains?: string[]
   category?: string
   tags?: string[]
   status?: 'pending' | 'done' | 'cancelled'
   priority?: 'low' | 'medium' | 'high'
   due_date?: string
+  photo_path?: string
+  gps_lat?: number
+  gps_lng?: number
 }
 
 export interface TodoFilters {