feat: install core dependencies (playwright, database, logging)

Install runtime dependencies:
- playwright: For browser automation
- mssql: SQL Server database connectivity
- mysql2: MySQL database connectivity
- winston: Logging framework
- exceljs: Excel file generation and manipulation

Install dev dependencies:
- @types/node: TypeScript definitions for Node.js

Update package.json scripts:
- postinstall: Automatically install Playwright Chromium
- test: Jest unit test runner
- test:e2e: Playwright end-to-end test runner

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

package.json

@@ -14,15 +14,22 @@
     "start": "electron-vite preview",
     "dev": "electron-vite dev",
     "build": "npm run typecheck && electron-vite build",
-    "postinstall": "electron-builder install-app-deps",
+    "postinstall": "electron-builder install-app-deps && playwright install chromium",
     "build:unpack": "npm run build && electron-builder --dir",
     "build:win": "npm run build && electron-builder --win",
     "build:mac": "electron-vite build && electron-builder --mac",
-    "build:linux": "electron-vite build && electron-builder --linux"
+    "build:linux": "electron-vite build && electron-builder --linux",
+    "test": "jest",
+    "test:e2e": "playwright test"
   },
   "dependencies": {
     "@electron-toolkit/preload": "^3.0.2",
-    "@electron-toolkit/utils": "^4.0.0"
+    "@electron-toolkit/utils": "^4.0.0",
+    "exceljs": "^4.4.0",
+    "mssql": "^12.2.0",
+    "mysql2": "^3.18.2",
+    "playwright": "^1.58.2",
+    "winston": "^3.19.0"
   },
   "devDependencies": {
     "@electron-toolkit/eslint-config-prettier": "^3.0.0",