fix: rewrite Dokploy client with correct API format (tRPC + x-api-key)

- Verified endpoints from @dokploy/mcp source code:
  - Auth: x-api-key header (not Authorization: Bearer)
  - Base URL: {url}/api
  - application.create → needs environmentId (not projectId)
  - Git provider saved separately: saveGiteaProvider / saveGithubProvider / saveGitProvider
  - Environment vars saved via saveEnvironment
  - Deploy is a separate call after create
  - Domain attach via domain.create
- Provisioning flow now multi-step:
  1. application.create
  2. saveGiteaProvider or saveGithubProvider (based on gitRepo URL)
  3. saveEnvironment (env vars)
  4. application.deploy
  5. domain.create (optional, non-fatal)
- Removed database provisioning (Dokploy apps use their own DB via env vars)
- Teardown simplified: deleteDomain → deleteApplication
- Updated instances route + cleanup route to match new API

src/app/api/aos/instances/[id]/route.ts

@@ -184,8 +184,7 @@ export async function DELETE(_req: Request, { params }: { params: Promise<{ id:
       try {
         const result = await dokploy.teardownInstance({
           dokployAppId: instance.dokployAppId ?? undefined,
-          dokployDbId: instance.dokployDbId ?? undefined,
-          dnsDomainId: meta.dokployDomainId,
+          dokployDomainId: meta.dokployDomainId,
         })
         steps.push(...result.steps)
         await db.instanceEvent.create({