audit: production safety fixes, cleanup, and documentation overhaul

CRITICAL fixes:
- Fix SQL injection in geoportal search (template literal in $queryRaw)
- Preserve enrichment data during GIS re-sync (upsert update explicit fields only)
- Fix ePay version race condition (advisory lock in transaction)
- Add requireAuth() to compress-pdf and unlock routes (were unauthenticated)
- Remove hardcoded Stirling PDF API key (env vars now required)

IMPORTANT fixes:
- Add admin role check on registratura debug-sequences endpoint
- Fix reserved slot race condition with advisory lock in transaction
- Use SSO identity in close-guard-dialog instead of hardcoded "Utilizator"
- Storage DELETE catches only P2025 (not found), re-throws real errors
- Add onDelete: SetNull for GisFeature → GisSyncRun relation
- Move portal-only users to PORTAL_ONLY_USERS env var
- Add security headers (X-Frame-Options, X-Content-Type-Options, Referrer-Policy)
- Add periodic cleanup for eTerra/ePay session caches and progress store
- Log warning when ePay dataDocument is missing (expiry fallback)

Cleanup:
- Delete orphaned rgi-test page (1086 lines, unregistered, inaccessible)
- Delete legacy/ folder (5 files, unreferenced from src/)
- Remove unused ensureBucketExists() from minio-client.ts

Documentation:
- Optimize CLAUDE.md: 464 → 197 lines (moved per-module details to docs/)
- Create docs/ARCHITECTURE-QUICK.md (80 lines: data flow, deps, env vars)
- Create docs/MODULE-MAP.md (140 lines: entry points, API routes, cross-deps)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/modules/parcel-sync/services/eterra-client.ts

@@ -79,11 +79,24 @@ type SessionEntry = {
 
 const globalStore = globalThis as {
   __eterraSessionStore?: Map<string, SessionEntry>;
+  __eterraCleanupTimer?: ReturnType<typeof setInterval>;
 };
 const sessionStore =
   globalStore.__eterraSessionStore ?? new Map<string, SessionEntry>();
 globalStore.__eterraSessionStore = sessionStore;
 
+// Periodic cleanup of expired sessions (every 5 minutes, 9-min TTL)
+if (!globalStore.__eterraCleanupTimer) {
+  globalStore.__eterraCleanupTimer = setInterval(() => {
+    const now = Date.now();
+    for (const [key, entry] of sessionStore.entries()) {
+      if (now - entry.lastUsed > 9 * 60_000) {
+        sessionStore.delete(key);
+      }
+    }
+  }, 5 * 60_000);
+}
+
 const makeCacheKey = (u: string, p: string) =>
   crypto.createHash("sha256").update(`${u}:${p}`).digest("hex");