fix(URGENT): SPA fallback serves sport2.html + 9 routers __future__ position

BUGS FIXED:
1. _serve_spa_fallback() returned index.html instead of sport2.html
   → User clicked /analitika /sufinanciranje etc and got wrong UI (DABI title)
   → Should serve sport2.html (PGZ SPORT - Platforma) with Analiza/Mreza/Link tabs

2. 9 router files had "from __future__" NOT at top of file
   → SyntaxError on import → routers SKIPPED → intermittent API failures
   → Affected: ocr.py, ocr_router.py, putni_nalozi.py, obrasci_router.py,
     clan_panel_router.py, audit_seal_router.py, erp_full_router.py,
     notif_router.py, seal.py

ROOT CAUSE:
Prior dehardcode batch (Master Zakon #1 sweep) inserted env-loading
imports BEFORE "from __future__ import annotations" — Python parser
requires __future__ FIRST.

FIX:
- _serve_spa_fallback() candidates list: sport2.html first
- Moved __future__ to top (preserving shebang + encoding + comments) in all 9

VERIFIED:
- 0 failed routers (was 7+)
- Analiza API: 10/10 success ~60-87ms
- Summary API: 5/5 success ~40ms
- sport.rinet.one/ → PGZ SPORT - Platforma (Analiza+Mreza tabs)
- All 9 SPA fallback routes serve sport2.html

Damir uploaded screenshot showing Analiza tab working (2,049 igraca,
82 klubova) but described as intermittent — root cause was router fails
causing some API endpoints to be missing/unreliable. Fixed.

routers/obrasci_router.py

@@ -1,4 +1,5 @@
 #!/usr/bin/env python3
+from __future__ import annotations
 from dotenv import load_dotenv
 load_dotenv('/opt/rinet-gpu/.env.master')
 # auto-added by patch_scrapers_with_dotenv.sh
@@ -24,7 +25,6 @@ Endpointi (montirani na /api/crm):
   POST   /forms/submissions/{id}/reject
   POST   /forms/{code_or_id}/submit    → kompatibilni shortcut: kreiraj+submit u jednom POST
 """
-from __future__ import annotations
 
 import json
 import hashlib