feat: separate frontend and backend services

pi-web/lib/api-types.ts

@@ -1,4 +1,20 @@
-import type { ResourceDiagnostic } from "@earendil-works/pi-coding-agent";
+// Structural copy of pi-coding-agent's ResourceDiagnostic/ResourceCollision so
+// the frontend no longer depends on the pi packages (the backend owns them).
+export interface ResourceCollision {
+  resourceType: "extension" | "skill" | "prompt" | "theme";
+  name: string;
+  winnerPath: string;
+  loserPath: string;
+  winnerSource?: string;
+  loserSource?: string;
+}
+
+export interface ResourceDiagnostic {
+  type: "warning" | "error" | "collision";
+  message: string;
+  path?: string;
+  collision?: ResourceCollision;
+}
 
 export interface SkillSearchResult {
   package: string;