feat: add main features

Agents for developpement added + frontend add + backend added. Git viewer created + agent and template creator + layout and project creator

frontend/src/adapters/system.ts

@@ -0,0 +1,40 @@
+/**
+ * Tauri adapter for {@link SystemGateway}. This is the *only* place (together
+ * with the sibling adapters) that touches `@tauri-apps/api`. Components reach it
+ * exclusively through the port — never `invoke()` directly.
+ */
+
+import { invoke } from "@tauri-apps/api/core";
+import { listen } from "@tauri-apps/api/event";
+import { open } from "@tauri-apps/plugin-dialog";
+
+import type { DomainEvent, HealthReport, Unsubscribe } from "@/domain";
+import type { SystemGateway } from "@/ports";
+
+/** Tauri event name carrying relayed domain events (mirror of `DOMAIN_EVENT`). */
+const DOMAIN_EVENT = "domain://event";
+
+export class TauriSystemGateway implements SystemGateway {
+  async health(note?: string): Promise<HealthReport> {
+    // The backend command takes an optional `request: { note }` (camelCase).
+    return invoke<HealthReport>("health", {
+      request: note === undefined ? null : { note },
+    });
+  }
+
+  async onDomainEvent(
+    handler: (event: DomainEvent) => void,
+  ): Promise<Unsubscribe> {
+    const unlisten = await listen<DomainEvent>(DOMAIN_EVENT, (e) => {
+      handler(e.payload);
+    });
+    return unlisten;
+  }
+
+  async pickFolder(): Promise<string | null> {
+    const result = await open({ directory: true, multiple: false });
+    if (result === null || result === undefined) return null;
+    // `open` with `multiple: false` returns a string when a path is chosen.
+    return typeof result === "string" ? result : null;
+  }
+}