feat: restructure as pnpm monorepo with Tauri desktop shell

- Migrate to packages/web + packages/desktop workspace layout via git mv
- Add Tauri v2 desktop shell with @tauri-apps/plugin-http for CORS bypass
- Configure Turborepo with package-level dependsOn build graph
- Add semantic-release with exec plugin for GHA output and disabled PR comments
- Fix http:default capability scope to allow all HTTP/HTTPS origins
- Add Vite Tauri integration (clearScreen, TAURI_DEV_HOST, target, envPrefix)
- Add semantic-release.yml and release.yml GitHub Actions workflows
- Fix all Biome lint errors (noArrayIndexKey, noNonNullAssertion, button types)

turbo.json

@@ -0,0 +1,23 @@
+{
+  "$schema": "https://turbo.build/schema.json",
+  "tasks": {
+    "build": {
+      "dependsOn": ["^build"],
+      "outputs": ["dist/**", "src-tauri/target/release/bundle/**"]
+    },
+    "typecheck": {
+      "dependsOn": ["^typecheck"],
+      "inputs": ["src/**", "tsconfig*.json"]
+    },
+    "lint": {
+      "inputs": ["src/**"]
+    },
+    "test": {
+      "inputs": ["src/**", "vitest.config.*", "package.json"]
+    },
+    "dev": {
+      "cache": false,
+      "persistent": true
+    }
+  }
+}