R7+: 5x P0 demo fixes — HNS direct link, avatar cache, logo home, klub→sportaši, smarter enrichment

1) HNS direct link u research_links: za sportaš s profile_url/source_url
   (npr. https://semafor.hns.family/igraci/X/...) generira [⭐DIRECT] link na vrhu liste,
   umjesto generic Google search. _research_links sada prima row dict.

2) Avatar cache buster: applyMeToHeader dodaje ?t=Date.now() na sve avatar img tagove.
   Avatar upload handler dodatno persistira novi avatar_url u localStorage.pgz_user
   tako da preživi page refresh + cross-page navigacije.

3) Logo home link: <div class='logo'> → <a href='/' class='logo'> u app.html i sport2.html.
   Klik na PGŽ SPORT logo vodi na public portal.

4) Klub → Sportaši drill-down: u klub Info tabu dodan button
   '👥 Vidi sportaše ovog kluba (N)' koji prebacuje na k-clan tab.
   Plus '🌐 Službena stranica' link kad klub ima web.

5) Smarter klub enrichment:
   - URL validacija (skip placeholder strings poput 'godisnjak_zspgz_2025')
   - Domain candidate guesser (slug → 16 candidate URLs s common HR TLD-ovima i sport prefix-ima)
   - Parallel HEAD probe (8 threads, 10s budget) — first 200 + name token match wins
   - Subpage scrape (/kontakt, /uprava, /o-nama, /o-klubu, /predsjednik) za richer evidence
   - HNK Orijent (id 3766) test: pogađa https://www.orijent.hr/, predlaže web+email+telefon+opis

E2E verified:
- 9/9 sidebar URL-ova → 200
- /users/me/gdpr-export → 200 (28KB JSON)
- /users/me/request-deletion → 200 (DB row pgz_sport.gdpr_erasure_requests)
- /enrich/klub/3766 → 4 proposed fields (web, email, telefon, opis)
- HNS sportaš research_links: ⭐ HNS profil DIRECT link na vrhu

Backend: routers/enrich_router.py
Frontend: static/app.html, static/sport2.html
Backups: _backups/sprint_1777940670/

Tag: R7-demo-ready

static/sport2.html

@@ -232,7 +232,7 @@ a.tag:hover,.tag[onclick]:hover{transform:translateY(-1px);filter:brightness(1.1
 <div class="app">
   <aside class="sb" id="sb">
     <div class="sb-h">
-      <div class="logo">PGŽ <span class="g">SPORT</span></div>
+      <a href="/" class="logo" style="text-decoration:none;color:inherit;cursor:pointer" title="Početna"><span style="font-weight:800;letter-spacing:.5px">PGŽ</span> <span class="g">SPORT</span></a>
       <div class="sub">Primorsko-goranska županija</div>
       <div class="sb-toggle" id="sb-toggle" onclick="toggleSidebar()" title="Skupi/raširi sidebar">≡</div>
     </div>
@@ -1349,6 +1349,12 @@ async function openKlub(id){
         <div class="k">Osnovan</div><div class="v">${txt(k.godina_osnutka)}</div>
         <div class="k">Nositelj kvalitete</div><div class="v">${k.nositelj_kvalitete?'<span class="tag gd">DA</span>':'<span class="tag">NE</span>'}</div>
       </div>
+      <div style="margin-top:14px;display:flex;gap:8px;flex-wrap:wrap">
+        <a class="btn primary" onclick="switchKlubTab(document.querySelector('.tab[onclick*=k-clan]'),'k-clan')" style="cursor:pointer;display:inline-flex;align-items:center;gap:6px">
+          👥 Vidi sportaše ovog kluba (${clanovi.length})
+        </a>
+        ${(k.web||k.web_stranica) ? '<a class="btn" href="'+esc(k.web||k.web_stranica)+'" target="_blank" style="display:inline-flex;align-items:center;gap:6px">🌐 Službena stranica</a>' : ''}
+      </div>
       ${k.napomena ? '<div class="card" style="margin-top:14px"><div class="card-t" style="margin-bottom:6px">Napomena</div><div style="font-size:12px;color:var(--t1);line-height:1.5">'+esc(k.napomena)+'</div></div>' : ''}
     </div>