Initial commit: EGBE chatbot template

Stripped from vercel/chatbot (Apache 2.0):
- Dropped @vercel/* packages and AI Gateway
- Removed artifacts feature (code/text/sheet/image side panel)
- Switched AI provider to @ai-sdk/openai-compatible -> EGBE LiteLLM
- Replaced Vercel Blob upload with data URLs
- Dropped Redis resumable streams and rate limiter (in-memory now)
- Added Dockerfile (Next.js standalone) + entrypoint that runs migrations
- Wired DATABASE_URL, EGBE_AI_API_URL/KEY, NEXT_PUBLIC_BASE_URL for app-deploy.sh

biome.jsonc

@@ -0,0 +1,56 @@
+{
+  "$schema": "./node_modules/@biomejs/biome/configuration_schema.json",
+  "extends": [
+    "ultracite/biome/core",
+    "ultracite/biome/next",
+    "ultracite/biome/react"
+  ],
+  "formatter": {
+    "indentStyle": "space",
+    "indentWidth": 2
+  },
+  "files": {
+    "includes": [
+      "**/*",
+      "!components/ai-elements",
+      "!components/elements",
+      "!components/ui",
+      "!lib/utils.ts",
+      "!hooks/use-mobile.ts"
+    ]
+  },
+  "linter": {
+    "rules": {
+      "suspicious": {
+        "noExplicitAny": "off",
+        "noUnknownAtRules": "off",
+        "noConsole": "off",
+        "noBitwiseOperators": "off"
+      },
+      "style": {
+        "noMagicNumbers": "off",
+        "noNestedTernary": "off",
+        "useConsistentTypeDefinitions": "off"
+      },
+      "nursery": {
+        "noUnnecessaryConditions": "off",
+        "useSortedClasses": "off"
+      },
+      "complexity": {
+        "noExcessiveCognitiveComplexity": "off",
+        "useSimplifiedLogicExpression": "off"
+      },
+      "a11y": {
+        "noSvgWithoutTitle": "off"
+      },
+      "correctness": {
+        "useUniqueElementIds": "off",
+        "useImageSize": "off"
+      },
+      "performance": {
+        "noBarrelFile": "off",
+        "useTopLevelRegex": "off"
+      }
+    }
+  }
+}