feat: add TypeScript and build configuration

- Add tsconfig.json with ES2020 target and strict mode
- Convert tailwind.config.js to TypeScript
- Update package.json with build scripts:
  - build:ts - Compile TypeScript
  - build:ts:watch - Watch mode for development
  - Updated paths for web/ directory structure
- Set up proper TypeScript compilation pipeline

package.json

@@ -3,13 +3,16 @@
   "version": "1.0.0",
   "description": "A self-hosted ebook management system",
   "scripts": {
-    "build:css": "tailwindcss -i ./cmd/server/static/input.css -o ./cmd/server/static/style.css --watch",
-    "build:css:prod": "tailwindcss -i ./cmd/server/static/input.css -o ./cmd/server/static/style.css --minify",
-    "postinstall": "mkdir -p cmd/server/static && curl -L https://unpkg.com/htmx.org@1.9.10/dist/htmx.min.js -o cmd/server/static/htmx.min.js"
+    "build:css": "tailwindcss -i ./web/static/input.css -o ./web/static/style.css --watch",
+    "build:css:prod": "tailwindcss -i ./web/static/input.css -o ./web/static/style.css --minify",
+    "build:ts": "tsc",
+    "build:ts:watch": "tsc --watch",
+    "postinstall": "mkdir -p web/static && curl -L https://unpkg.com/htmx.org@1.9.10/dist/htmx.min.js -o web/static/htmx.min.js"
   },
   "devDependencies": {
-    "tailwindcss": "^3.4.0",
+    "@tailwindcss/forms": "^0.5.7",
     "autoprefixer": "^10.4.0",
-    "@tailwindcss/forms": "^0.5.7"
+    "tailwindcss": "^3.4.0",
+    "typescript": "^5.9.3"
   }
-}
+}