feat(frontend): API layer + stores Pinia

Ajoute le client Axios, les modules API (gardens, varieties, plantings,
tasks) et les stores Pinia correspondants. Corrige tsconfig.json pour
inclure vite/client et DOM.Iterable.

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

frontend/src/api/client.ts

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+import axios from 'axios'
+
+export default axios.create({
+  baseURL: import.meta.env.VITE_API_URL ?? '',
+})

frontend/src/api/gardens.ts

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+import client from './client'
+
+export interface Garden {
+  id?: number
+  nom: string
+  description?: string
+  type: string
+  latitude?: number
+  longitude?: number
+  adresse?: string
+  exposition?: string
+  ombre?: string
+  sol_type?: string
+  grille_largeur: number
+  grille_hauteur: number
+}
+
+export interface GardenCell {
+  id?: number
+  garden_id?: number
+  col: number
+  row: number
+  libelle?: string
+  etat: string
+  notes?: string
+}
+
+export interface Measurement {
+  id?: number
+  garden_id?: number
+  temp_air?: number
+  temp_sol?: number
+  humidite_air?: number
+  humidite_sol?: number
+  source?: string
+  ts?: string
+}
+
+export const gardensApi = {
+  list: () => client.get<Garden[]>('/api/gardens').then(r => r.data),
+  get: (id: number) => client.get<Garden>(`/api/gardens/${id}`).then(r => r.data),
+  create: (g: Partial<Garden>) => client.post<Garden>('/api/gardens', g).then(r => r.data),
+  update: (id: number, g: Partial<Garden>) => client.put<Garden>(`/api/gardens/${id}`, g).then(r => r.data),
+  delete: (id: number) => client.delete(`/api/gardens/${id}`),
+  cells: (id: number) => client.get<GardenCell[]>(`/api/gardens/${id}/cells`).then(r => r.data),
+  measurements: (id: number) => client.get<Measurement[]>(`/api/gardens/${id}/measurements`).then(r => r.data),
+  addMeasurement: (id: number, m: Partial<Measurement>) =>
+    client.post<Measurement>(`/api/gardens/${id}/measurements`, m).then(r => r.data),
+}

frontend/src/api/plantings.ts

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+import client from './client'
+
+export interface Planting {
+  id?: number
+  garden_id: number
+  variety_id: number
+  cell_id?: number
+  date_plantation?: string
+  quantite: number
+  statut: string
+  notes?: string
+}
+
+export interface PlantingEvent {
+  id?: number
+  planting_id?: number
+  type: string
+  note?: string
+  ts?: string
+}
+
+export const plantingsApi = {
+  list: () => client.get<Planting[]>('/api/plantings').then(r => r.data),
+  get: (id: number) => client.get<Planting>(`/api/plantings/${id}`).then(r => r.data),
+  create: (p: Partial<Planting>) => client.post<Planting>('/api/plantings', p).then(r => r.data),
+  update: (id: number, p: Partial<Planting>) => client.put<Planting>(`/api/plantings/${id}`, p).then(r => r.data),
+  delete: (id: number) => client.delete(`/api/plantings/${id}`),
+  events: (id: number) => client.get<PlantingEvent[]>(`/api/plantings/${id}/events`).then(r => r.data),
+  addEvent: (id: number, e: Partial<PlantingEvent>) =>
+    client.post<PlantingEvent>(`/api/plantings/${id}/events`, e).then(r => r.data),
+}

frontend/src/api/tasks.ts

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+import client from './client'
+
+export interface Task {
+  id?: number
+  titre: string
+  description?: string
+  garden_id?: number
+  priorite: string
+  echeance?: string
+  statut: string
+}
+
+export const tasksApi = {
+  list: (params?: { statut?: string; garden_id?: number }) =>
+    client.get<Task[]>('/api/tasks', { params }).then(r => r.data),
+  get: (id: number) => client.get<Task>(`/api/tasks/${id}`).then(r => r.data),
+  create: (t: Partial<Task>) => client.post<Task>('/api/tasks', t).then(r => r.data),
+  update: (id: number, t: Partial<Task>) => client.put<Task>(`/api/tasks/${id}`, t).then(r => r.data),
+  delete: (id: number) => client.delete(`/api/tasks/${id}`),
+}

frontend/src/api/varieties.ts

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+import client from './client'
+
+export interface PlantVariety {
+  id?: number
+  nom_commun: string
+  nom_botanique?: string
+  variete?: string
+  famille?: string
+  type_plante?: string
+  besoin_eau?: string
+  espacement_cm?: number
+  plantation_mois?: string
+  recolte_mois?: string
+  notes?: string
+}
+
+export const varietiesApi = {
+  list: () => client.get<PlantVariety[]>('/api/varieties').then(r => r.data),
+  get: (id: number) => client.get<PlantVariety>(`/api/varieties/${id}`).then(r => r.data),
+  create: (v: Partial<PlantVariety>) => client.post<PlantVariety>('/api/varieties', v).then(r => r.data),
+  update: (id: number, v: Partial<PlantVariety>) => client.put<PlantVariety>(`/api/varieties/${id}`, v).then(r => r.data),
+  delete: (id: number) => client.delete(`/api/varieties/${id}`),
+}