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/core/storage/minio-client.ts

@@ -18,16 +18,3 @@ if (process.env.NODE_ENV !== "production")
   globalForMinio.minioClient = minioClient;
 
 export const MINIO_BUCKET_NAME = process.env.MINIO_BUCKET_NAME || "tools";
-
-// Helper to ensure bucket exists
-export async function ensureBucketExists() {
-  try {
-    const exists = await minioClient.bucketExists(MINIO_BUCKET_NAME);
-    if (!exists) {
-      await minioClient.makeBucket(MINIO_BUCKET_NAME, "eu-west-1");
-      console.log(`Bucket '${MINIO_BUCKET_NAME}' created successfully.`);
-    }
-  } catch (error) {
-    console.error("Error checking/creating MinIO bucket:", error);
-  }
-}