docs: update tile evaluation + monitoring + add geoportal improvement mega prompt

- TILE-SERVER-EVALUATION.md: updated to reflect current architecture (PMTiles z0-z18)
- MODULE-MAP.md: added PMTiles + tile-cache to Geoportal section
- Monitor: timeout increased to 90 min for z18 builds, description updated
- Added PROMPT-GEOPORTAL-IMPROVE.md with mega prompt for future sessions
  (includes MLT check, mvt-rs evaluation prompt, operational commands)

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

docs/MODULE-MAP.md

@@ -129,9 +129,11 @@ Quick reference: entry points, key files, API routes, and cross-module dependenc
 ### Geoportal
 - **Route**: `/geoportal`
 - **Main component**: `components/geoportal-module.tsx`
-- **Key components**: `components/map-viewer.tsx` (MapLibre), `components/basemap-switcher.tsx`, `components/selection-toolbar.tsx`, `components/feature-info-panel.tsx`
-- **API routes**: `/api/geoportal/*` (search, boundary-check, uat-bounds, setup-views)
-- **Cross-deps**: **parcel-sync** (declared dependency — uses PostGIS data)
+- **Key components**: `components/map-viewer.tsx` (MapLibre, PMTiles protocol), `components/basemap-switcher.tsx`, `components/selection-toolbar.tsx`, `components/feature-info-panel.tsx`
+- **Tile infrastructure**: Martin v1.4.0 (live MVT) -> nginx tile-cache (7d TTL) -> Traefik; PMTiles (z0-z18, MinIO) for pre-generated overview tiles
+- **Monitor page**: `/monitor` — nginx/Martin/PMTiles status, rebuild + warm-cache actions
+- **API routes**: `/api/geoportal/*` (search, boundary-check, uat-bounds, setup-views, monitor)
+- **Cross-deps**: **parcel-sync** (declared dependency — uses PostGIS data), **MinIO** (PMTiles storage), **N8N** (rebuild webhook)
 
 ### Visual CoPilot
 - **Route**: `/visual-copilot`