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

lib/ai/tools/get-weather.ts

@@ -0,0 +1,78 @@
+import { tool } from "ai";
+import { z } from "zod";
+
+async function geocodeCity(
+  city: string
+): Promise<{ latitude: number; longitude: number } | null> {
+  try {
+    const response = await fetch(
+      `https://geocoding-api.open-meteo.com/v1/search?name=${encodeURIComponent(city)}&count=1&language=en&format=json`
+    );
+
+    if (!response.ok) {
+      return null;
+    }
+
+    const data = await response.json();
+
+    if (!data.results || data.results.length === 0) {
+      return null;
+    }
+
+    const result = data.results[0];
+    return {
+      latitude: result.latitude,
+      longitude: result.longitude,
+    };
+  } catch {
+    return null;
+  }
+}
+
+export const getWeather = tool({
+  description:
+    "Get the current weather at a location. You can provide either coordinates or a city name.",
+  inputSchema: z.object({
+    latitude: z.number().optional(),
+    longitude: z.number().optional(),
+    city: z
+      .string()
+      .describe("City name (e.g., 'San Francisco', 'New York', 'London')")
+      .optional(),
+  }),
+  execute: async (input) => {
+    let latitude: number;
+    let longitude: number;
+
+    if (input.city) {
+      const coords = await geocodeCity(input.city);
+      if (!coords) {
+        return {
+          error: `Could not find coordinates for "${input.city}". Please check the city name.`,
+        };
+      }
+      latitude = coords.latitude;
+      longitude = coords.longitude;
+    } else if (input.latitude !== undefined && input.longitude !== undefined) {
+      latitude = input.latitude;
+      longitude = input.longitude;
+    } else {
+      return {
+        error:
+          "Please provide either a city name or both latitude and longitude coordinates.",
+      };
+    }
+
+    const response = await fetch(
+      `https://api.open-meteo.com/v1/forecast?latitude=${latitude}&longitude=${longitude}&current=temperature_2m&hourly=temperature_2m&daily=sunrise,sunset&timezone=auto`
+    );
+
+    const weatherData = await response.json();
+
+    if ("city" in input) {
+      weatherData.cityName = input.city;
+    }
+
+    return weatherData;
+  },
+});