Remove count from AI search prompt, add query prioritization

- count no longer part of prompt or JSON output — fixed at 50 in backend
- Added prioritization rules: most common term wins (Dachdecker > Spengler)
- Cleaner examples without count field

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

components/search/AiSearchModal.tsx

@@ -173,7 +173,6 @@ export function AiSearchModal({ onStart, onClose }: AiSearchModalProps) {
                   )}
                 </div>
                 <div style={{ display: "flex", alignItems: "center", gap: 8 }}>
-                  <span style={{ fontSize: 11, color: "#4b5563" }}>{q.count} Leads</span>
                   <div style={{
                     width: 16, height: 16, borderRadius: 4,
                     border: selected.has(i) ? "none" : "1px solid #2e2e3e",