feat: volume scopes redesign — replace shared/isolated with 6 scopes

Replace confusing shared/isolated volume modes with explicit scopes:
- instance: per-deploy isolated directory
- stage: shared within a stage across deploys
- project: shared across all stages
- project_named: named group within a project
- named: global named volume across projects
- ephemeral: tmpfs in-memory mount

Includes schema migration (shared→project, isolated→instance),
backward-compatible deployer resolution, scope metadata API endpoint,
and redesigned volume editor UI with scope guide cards and hints.

web/src/lib/api.ts

@@ -20,7 +20,8 @@ import type {
 	StageEnv,
 	StandaloneProxy,
 	ValidationResult,
-	Volume
+	Volume,
+	VolumeScopeInfo
 } from './types';
 
 // ── Helpers ─────────────────────────────────────────────────────────
@@ -327,7 +328,7 @@ export function listVolumes(projectId: string): Promise<Volume[]> {
 
 export function createVolume(
 	projectId: string,
-	data: { source: string; target: string; mode?: string }
+	data: { source: string; target: string; scope: string; name?: string; mode?: string }
 ): Promise<Volume> {
 	return post<Volume>(`/api/projects/${projectId}/volumes`, data);
 }
@@ -335,11 +336,15 @@ export function createVolume(
 export function updateVolume(
 	projectId: string,
 	volId: string,
-	data: { source?: string; target?: string; mode?: string }
+	data: { source?: string; target?: string; scope?: string; name?: string; mode?: string }
 ): Promise<Volume> {
 	return put<Volume>(`/api/projects/${projectId}/volumes/${volId}`, data);
 }
 
+export function listVolumeScopes(): Promise<VolumeScopeInfo[]> {
+	return get<VolumeScopeInfo[]>('/api/volumes/scopes');
+}
+
 export function deleteVolume(
 	projectId: string,
 	volId: string

web/src/lib/i18n/en.json

@@ -120,15 +120,16 @@
   },
   "volumeEditor": {
     "title": "Volume Mounts",
-    "description": "Configure volume mounts for containers.",
-    "sharedDesc": "Shared mode uses the source path as-is for all instances.",
-    "isolatedDesc": "Isolated mode appends /{stage}-{tag}/ to the source, giving each instance its own directory.",
+    "description": "Configure volume mounts for containers. Choose a scope to control how volumes are shared between deploys.",
     "sourceHost": "Source (Host)",
     "targetContainer": "Target (Container)",
-    "mode": "Mode",
+    "scope": "Scope",
+    "nameColumn": "Name",
+    "namePlaceholder": "e.g. shared-db",
+    "requiresName": "requires name",
+    "noHostPath": "no host path",
+    "tmpfs": "tmpfs (in-memory)",
     "actions": "Actions",
-    "shared": "Shared",
-    "isolated": "Isolated",
     "edit": "Edit",
     "delete": "Delete",
     "save": "Save",

web/src/lib/i18n/ru.json

@@ -120,15 +120,16 @@
   },
   "volumeEditor": {
     "title": "Тома",
-    "description": "Настройка монтирования томов для контейнеров.",
-    "sharedDesc": "Режим «Общий» использует путь источника как есть для всех экземпляров.",
-    "isolatedDesc": "Режим «Изолированный» добавляет /{stage}-{tag}/ к источнику, создавая свою директорию для каждого экземпляра.",
+    "description": "Настройка монтирования томов для контейнеров. Выберите область видимости для управления общим доступом между развёртываниями.",
     "sourceHost": "Источник (хост)",
     "targetContainer": "Цель (контейнер)",
-    "mode": "Режим",
+    "scope": "Область",
+    "nameColumn": "Имя",
+    "namePlaceholder": "напр. shared-db",
+    "requiresName": "требуется имя",
+    "noHostPath": "нет пути на хосте",
+    "tmpfs": "tmpfs (в памяти)",
     "actions": "Действия",
-    "shared": "Общий",
-    "isolated": "Изолированный",
     "edit": "Изменить",
     "delete": "Удалить",
     "save": "Сохранить",

web/src/lib/types.ts

@@ -161,17 +161,30 @@ export interface EntityPickerItem {
 	disabledHint?: string;
 }
 
+/** Volume scope determines the sharing level. */
+export type VolumeScope = 'instance' | 'stage' | 'project' | 'project_named' | 'named' | 'ephemeral';
+
 /** Volume mount configuration for a project. */
 export interface Volume {
 	id: string;
 	project_id: string;
 	source: string;
 	target: string;
-	mode: 'shared' | 'isolated';
+	mode?: string;
+	scope: VolumeScope;
+	name: string;
 	created_at: string;
 	updated_at: string;
 }
 
+/** Scope metadata returned by GET /api/volumes/scopes. */
+export interface VolumeScopeInfo {
+	scope: VolumeScope;
+	description: string;
+	needs_name: boolean;
+	path_example: string;
+}
+
 /** Docker daemon health check result. */
 export interface DockerHealth {
 	connected: boolean;