feat: add Turborepo per-project monorepo scaffold and project API

- Add Turborepo scaffold templates (apps: product, website, admin, storybook; packages: ui, tokens, types, config)
- Add ProjectRecord and AppRecord types to control plane
- Add Gitea integration service (repo creation, scaffold push, webhooks)
- Add Coolify integration service (project + per-app service provisioning with turbo --filter)
- Add project routes: GET/POST /projects, GET /projects/:id/apps, POST /projects/:id/deploy
- Update chat route to inject project/monorepo context into AI requests
- Add deploy_app and scaffold_app tools to Gemini tool set
- Update deploy executor with monorepo-aware /execute/deploy endpoint
- Add TURBOREPO_MIGRATION_PLAN.md documenting rationale and scope

Co-authored-by: Cursor <cursoragent@cursor.com>

platform/scripts/templates/turborepo/README.md

@@ -0,0 +1,57 @@
+# {{project-name}}
+
+A full-stack monorepo powered by [Turborepo](https://turbo.build).
+
+## Structure
+
+```
+apps/
+  product/      — core user-facing application
+  website/      — marketing and landing pages
+  admin/        — internal admin tooling
+  storybook/    — component browser and design system
+packages/
+  ui/           — shared React component library
+  tokens/       — design tokens (colors, typography, spacing)
+  types/        — shared TypeScript types
+  config/       — shared eslint and tsconfig base configs
+```
+
+## Getting Started
+
+```bash
+pnpm install
+pnpm dev
+```
+
+## Running a specific app
+
+```bash
+turbo run dev --filter=product
+turbo run dev --filter=website
+turbo run dev --filter=admin
+```
+
+## Building
+
+```bash
+pnpm build
+# or a single app
+turbo run build --filter=product
+```
+
+## Adding a new app
+
+```bash
+cd apps
+npx create-next-app@latest my-new-app
+# then add it to the workspace — pnpm will pick it up automatically
+```
+
+## Adding a new shared package
+
+```bash
+mkdir packages/my-package
+# add a package.json with name "@{{project-slug}}/my-package"
+# reference it from any app: "@{{project-slug}}/my-package": "workspace:*"
+```