refactor: convert to bun-workspaces monorepo (desktop/ + www/)

- Move the Tauri app (React frontend + Rust backend) into desktop/ via
  git mv — configs unchanged (relative paths: tauri.conf.json, vite.config.ts)
- Root package.json becomes a private bun workspace container with
  orchestration scripts; desktop package renamed gridline-desktop
- Scaffold www/ with Astro 7 + Tailwind v4 (hand-wired vite plugin,
  static output, ready for Dokploy)
- Update release.yml for the new layout: projectPath: desktop,
  desktop/src-tauri resource paths, rust-cache workspace path
- Update README + AGENTS.md structure trees and dev commands
- Verified: vitest (1074), cargo test (354), desktop build, tauri dev
  (window launches), tauri build (dmg + app bundles), Astro build

package.json

@@ -1,57 +1,13 @@
 {
-    "name": "gridline",
-    "private": true,
-    "version": "0.7.10",
-    "description": "An open-source, high-performance database GUI client for PostgreSQL and beyond",
-    "type": "module",
-    "scripts": {
-        "test": "vitest run",
-        "test:watch": "vitest",
-        "dev": "vite",
-        "tauri:dev": "tauri dev",
-        "build": "tsc && vite build",
-        "preview": "vite preview",
-        "tauri": "tauri"
-    },
-    "dependencies": {
-        "@dnd-kit/core": "^6.3.1",
-        "@dnd-kit/sortable": "^10.0.0",
-        "@dnd-kit/utilities": "^3.2.2",
-        "@fontsource/outfit": "^5.3.0",
-        "@fontsource/space-mono": "^5.3.0",
-        "@monaco-editor/react": "^4.7.0",
-        "@tailwindcss/vite": "^4.3.3",
-        "@tanstack/react-virtual": "^3.14.8",
-        "@tauri-apps/api": "^2",
-        "@tauri-apps/plugin-dialog": "^2.7.2",
-        "@tauri-apps/plugin-fs": "^2.5.1",
-        "@tauri-apps/plugin-opener": "^2",
-        "@xyflow/react": "^12.11.2",
-        "dagre": "^0.8.5",
-        "fflate": "^0.8.3",
-        "html-to-image": "^1.11.13",
-        "lucide-react": "^1.26.0",
-        "monaco-editor": "^0.56.0",
-        "motion": "^12.42.2",
-        "react": "^19.1.0",
-        "react-dom": "^19.1.0",
-        "simple-icons": "^16.27.1",
-        "sql-formatter": "^15.8.2",
-        "tauri-plugin-keyring-store-api": "^0.2.0",
-        "zustand": "^5.0.14"
-    },
-    "devDependencies": {
-        "@tauri-apps/cli": "^2",
-        "@testing-library/jest-dom": "^7.0.0",
-        "@testing-library/react": "^16.3.2",
-        "@testing-library/user-event": "^14.6.1",
-        "@types/dagre": "^0.7.54",
-        "@types/react": "^19.1.8",
-        "@types/react-dom": "^19.1.6",
-        "@vitejs/plugin-react": "^4.6.0",
-        "jsdom": "^29.1.1",
-        "typescript": "~5.8.3",
-        "vite": "^7.0.4",
-        "vitest": "^4.1.10"
-    }
+  "name": "gridline",
+  "private": true,
+  "version": "0.7.10",
+  "workspaces": ["desktop", "www"],
+  "scripts": {
+    "dev:desktop": "bun run --filter gridline-desktop dev",
+    "tauri:dev": "bun run --filter gridline-desktop tauri:dev",
+    "dev:www": "bun run --filter gridline-www dev",
+    "build:www": "bun run --filter gridline-www build",
+    "test": "bun run --filter gridline-desktop test"
+  }
 }