Add Tauri app backend setup with dependencies and basic build script

- Introduced `build.rs` for Tauri build process initialization.
- Added `Cargo.toml` with dependencies for Tauri plugins, serialization, cryptography, and database handling.
- Generated `Cargo.lock` to lock package versions for consistency.

src-tauri/tauri.conf.json

@@ -0,0 +1,52 @@
+{
+  "$schema": "https://raw.githubusercontent.com/tauri-apps/tauri/dev/crates/tauri-config-schema/schema.json",
+  "productName": "ERitors Scribe",
+  "version": "0.5.0",
+  "identifier": "com.eritors.scribe.desktop",
+  "build": {
+    "frontendDist": "../out",
+    "devUrl": "http://localhost:4000",
+    "beforeDevCommand": "npm run dev",
+    "beforeBuildCommand": "npm run build"
+  },
+  "app": {
+    "windows": [
+      {
+        "label": "main",
+        "title": "ERitors Scribe",
+        "width": 1200,
+        "height": 800,
+        "resizable": true,
+        "fullscreen": false,
+        "minWidth": 900,
+        "minHeight": 600
+      }
+    ],
+    "security": {
+      "csp": "default-src 'self'; script-src 'self' 'unsafe-eval'; style-src 'self' 'unsafe-inline'; img-src 'self' data: blob: https://scribe.eritors.com; connect-src 'self' ipc: http://ipc.localhost https://api.eritors.com https://scribe.eritors.com; font-src 'self' data:"
+    }
+  },
+  "plugins": {
+    "updater": {
+      "endpoints": ["https://api.eritors.com/download/app/desktop/update/{{target}}/{{current_version}}"],
+      "pubkey": "dW50cnVzdGVkIGNvbW1lbnQ6IG1pbmlzaWduIHB1YmxpYyBrZXk6IDI5OTQwMjI3Qjg3REZDNjgKUldSby9IMjRKd0tVS2NDQTVZNnphYUtPMElXTHBqYXpsSDFFVnNXQm01U1BZWjB2MVNicHRKN0EK"
+    }
+  },
+  "bundle": {
+    "active": true,
+    "createUpdaterArtifacts": true,
+    "targets": "all",
+    "icon": [
+      "icons/32x32.png",
+      "icons/128x128.png",
+      "icons/128x128@2x.png",
+      "icons/icon.icns",
+      "icons/icon.ico"
+    ],
+    "macOS": {
+      "signingIdentity": null,
+      "hardenedRuntime": true,
+      "entitlements": "entitlements.mac.plist"
+    }
+  }
+}