Stitch redesign, Energieversorger-Kampagne, UI improvements

- Apply Stitch design system to leadspeicher, suche, TopBar, globals.css
- Add Energieversorger queue campaign (Netzbetreiber, Fernwärme, Industriepark)
  with BW + Bayern priority, tracks usage per term+location combo
- Remove TopBar right-side actions (Leads finden, bell, settings)
- Remove mode tabs from manual search, rename KI button
- Fix Google Fonts @import order (move to <link> in layout.tsx)
- Add cursor-pointer globally via globals.css
- Responsive fixes for campaign buttons and KI button
- Fix .dockerignore to exclude .env from image build
- Add stadtwerke-cities API + city data (50 cities per Bundesland)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.dockerignore

@@ -12,7 +12,8 @@ out
 *.db-wal
 /data
 
-# Environment files (injected at runtime)
+# Environment files (injected at runtime via Coolify)
+.env
 .env.local
 .env.*.local