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>

components/search/AiSearchModal.tsx

@@ -121,7 +121,7 @@ export function AiSearchModal({ onStart, onClose, searchMode = "custom" }: AiSea
             onBlur={e => { e.currentTarget.style.borderColor = "#1e1e2e"; }}
           />
           <p style={{ margin: "4px 0 0", fontSize: 11, color: "#4b5563" }}>
-            Tipp: Branche, Region, Firmengröße und gewünschten Entscheidungsträger erwähnen · Strg+Enter zum Generieren
+            Tipp: Branche, Region, Firmengröße und gewünschten Entscheidungsträger erwähnen
           </p>
         </div>