feat(frontend): support des providers OpenCode cloud (#92)

Ajoute l'UI de configuration des providers OpenCode cloud dans le wizard
first-run (sélection, édition, sauvegarde, suppression), le domaine et
les ports associés, ainsi que les adapters HTTP/mock correspondants.

Build + 952 tests verts, comportements clés vérifiés en exécution réelle,
y compris un test de couverture ajouté pour le parcours d'édition.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

frontend/src/domain/index.ts

@@ -999,6 +999,38 @@ export interface OpenCodeConfig {
   localModelServerId?: string;
 }
 
+/**
+ * Configuration for an OpenCode profile backed by a **cloud** provider from the
+ * OpenCode registry (Anthropic, OpenRouter, …), as opposed to the custom
+ * `llamacpp` provider of {@link OpenCodeConfig}. Mirror of the backend
+ * `OpenCodeProviderConfig` (camelCase wire format). `apiKeyRef` is an opaque
+ * reference into the backend `SecretStore` — never the literal key, which is
+ * only ever sent (never read back) via
+ * {@link ProfileGateway.saveOpenCodeProviderProfile}.
+ */
+export interface OpenCodeProviderConfig {
+  /** Provider id in the OpenCode registry (e.g. `"anthropic"`). */
+  providerId: string;
+  /** Model name served by this provider. */
+  model: string;
+  /** Opaque reference to the sealed API key; never the literal key. */
+  apiKeyRef: string;
+}
+
+/**
+ * One entry of the static OpenCode cloud-provider catalogue (mirror of the
+ * backend `OpenCodeProviderDto`), returned by
+ * {@link ProfileGateway.listOpenCodeProviders}.
+ */
+export interface OpenCodeProviderCatalogEntry {
+  /** Provider id in the OpenCode registry (e.g. `"anthropic"`). */
+  providerId: string;
+  /** Human-readable label for the picker UI. */
+  displayName: string;
+  /** Model names this provider serves, offered for selection. */
+  models: string[];
+}
+
 /**
  * A declarative AI-CLI profile (mirror of the backend `AgentProfile`). `id` is a
  * UUID string; `detect` is the optional detection command line.
@@ -1029,6 +1061,12 @@ export interface AgentProfile {
   chatHttp?: HttpChatConfig;
   /** OpenCode process-backed config. Present for `structuredAdapter: "openCode"`. */
   opencode?: OpenCodeConfig;
+  /**
+   * OpenCode **cloud** provider config (ticket #92). Mutually exclusive with
+   * {@link opencode}: a profile is either local (`llamacpp`) or cloud, never
+   * both.
+   */
+  opencodeProvider?: OpenCodeProviderConfig;
 }
 
 /** Availability of a candidate profile after detection (mirror of the DTO). */