chore: optimize Vercel costs by removing analytics and configuring functions (#238)

- Create vercel.json with optimized function settings:
  - Chat API: 512MB memory, 120s timeout
  - Other APIs: 256MB memory, 10s timeout
- Remove @vercel/analytics package and imports
- Reduce chat route maxDuration from 300s to 120s

Expected savings: $2-4/month, keeping costs under $20 included credit

package-lock.json

@@ -1,12 +1,12 @@
 {
     "name": "next-ai-draw-io",
-    "version": "0.3.0",
+    "version": "0.4.0",
     "lockfileVersion": 3,
     "requires": true,
     "packages": {
         "": {
             "name": "next-ai-draw-io",
-            "version": "0.3.0",
+            "version": "0.4.0",
             "license": "Apache-2.0",
             "dependencies": {
                 "@ai-sdk/amazon-bedrock": "^3.0.62",
@@ -33,7 +33,6 @@
                 "@radix-ui/react-switch": "^1.2.6",
                 "@radix-ui/react-tooltip": "^1.1.8",
                 "@radix-ui/react-use-controllable-state": "^1.2.2",
-                "@vercel/analytics": "^1.5.0",
                 "@xmldom/xmldom": "^0.9.8",
                 "ai": "^5.0.89",
                 "base-64": "^1.0.0",
@@ -6028,44 +6027,6 @@
                 "win32"
             ]
         },
-        "node_modules/@vercel/analytics": {
-            "version": "1.5.0",
-            "resolved": "https://registry.npmjs.org/@vercel/analytics/-/analytics-1.5.0.tgz",
-            "integrity": "sha512-MYsBzfPki4gthY5HnYN7jgInhAZ7Ac1cYDoRWFomwGHWEX7odTEzbtg9kf/QSo7XEsEAqlQugA6gJ2WS2DEa3g==",
-            "license": "MPL-2.0",
-            "peerDependencies": {
-                "@remix-run/react": "^2",
-                "@sveltejs/kit": "^1 || ^2",
-                "next": ">= 13",
-                "react": "^18 || ^19 || ^19.0.0-rc",
-                "svelte": ">= 4",
-                "vue": "^3",
-                "vue-router": "^4"
-            },
-            "peerDependenciesMeta": {
-                "@remix-run/react": {
-                    "optional": true
-                },
-                "@sveltejs/kit": {
-                    "optional": true
-                },
-                "next": {
-                    "optional": true
-                },
-                "react": {
-                    "optional": true
-                },
-                "svelte": {
-                    "optional": true
-                },
-                "vue": {
-                    "optional": true
-                },
-                "vue-router": {
-                    "optional": true
-                }
-            }
-        },
         "node_modules/@vercel/oidc": {
             "version": "3.0.5",
             "resolved": "https://registry.npmjs.org/@vercel/oidc/-/oidc-3.0.5.tgz",