fix(cloud): persist configuration and load release-image packages (#18335)

Land the approved Cloud configuration and release-image package stack.

Includes the separately reviewed adapter settings (#18335), external adapters (#18333), bundled plugins (#18336), startup configuration (#18339), and migration/package checks (#18341).

Includes the final image-owned loader and linked-dependency inventory corrections.

Verified stack head: 462716170d.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

server/src/paths.ts

@@ -1,6 +1,7 @@
 import fs from "node:fs";
 import path from "node:path";
 import { resolveDefaultConfigPath } from "./home-paths.js";
+import { isCloudManagedInstance } from "./services/cloud-instance.js";
 
 const PAPERCLIP_CONFIG_BASENAME = "config.json";
 const PAPERCLIP_ENV_FILENAME = ".env";
@@ -26,6 +27,7 @@ function findConfigFileFromAncestors(startDir: string): string | null {
 export function resolvePaperclipConfigPath(overridePath?: string): string {
   if (overridePath) return path.resolve(overridePath);
   if (process.env.PAPERCLIP_CONFIG) return path.resolve(process.env.PAPERCLIP_CONFIG);
+  if (isCloudManagedInstance()) return resolveDefaultConfigPath();
   return findConfigFileFromAncestors(process.cwd()) ?? resolveDefaultConfigPath();
 }