Add Weather integration adapter

Implements testConnection against wttr.in's JSON API using the
configured location, no API key required. listResources is intentionally
omitted since weather conditions don't map to the resource-health model.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01BbJV5nm8KPVH1oNJYKpnoF

backend/src/integrations/registry.ts

@@ -4,6 +4,7 @@ import { docker } from './docker.js'
 import { proxmox } from './proxmox.js'
 import { netbird } from './netbird.js'
 import { cloudflare } from './cloudflare.js'
+import { weather } from './weather.js'
 
 const notImplemented: IntegrationAdapter = {
   async testConnection() {
@@ -18,5 +19,5 @@ export const adapterRegistry: Record<IntegrationType, IntegrationAdapter> = {
   netbird,
   cloudflare,
   aws: notImplemented,
-  weather: notImplemented,
+  weather,
 }

backend/src/integrations/weather.ts

@@ -0,0 +1,19 @@
+import type { IntegrationAdapter } from './types.js'
+
+export const weather: IntegrationAdapter = {
+  async testConnection(config) {
+    const location = config.location
+    if (!location) return { ok: false, message: 'Missing location' }
+    try {
+      const res = await fetch(`https://wttr.in/${encodeURIComponent(location)}?format=j1`, {
+        headers: { 'User-Agent': 'curl' },
+      })
+      if (!res.ok) return { ok: false, message: `HTTP ${res.status}` }
+      const body = (await res.json()) as { current_condition?: unknown[] }
+      if (!body.current_condition?.length) return { ok: false, message: 'Location not found' }
+      return { ok: true, message: 'Connected' }
+    } catch (err) {
+      return { ok: false, message: err instanceof Error ? err.message : 'Connection failed' }
+    }
+  },
+}