Initial portal commit: landing + 9 AI-powered apps

Apps:
- dwg-rooms: extract room numbers from DWG/DXF
- dwg-counting: count symbols in PDF drawings (OpenCV template matching)
- contract-check: review PDF contracts against a checklist (Claude vision + Tesseract OCR fallback)
- email-drafter: bullet notes → polished Czech/English business emails
- invoice-extractor: PDF/image invoice → structured data → Excel
- translator: Czech-first translator across 19 languages with tone control
- vv-check: find inconsistent unit prices across VV sheets in one workbook
- vv-compare: diff original vs new VV files (changes / added / removed)
- feature-request: portal users submit ideas + sample files

Infrastructure:
- LiteLLM gateway with per-app virtual keys + budgets
- Langfuse observability
- Geist font, shared theme, cross-subdomain back link + theme sync via cookie/URL
- Caddy reverse proxy on *.klas.chat

vv-check/static/extra.css

@@ -0,0 +1,133 @@
+/* VV check specific styles */
+
+.processing-sub {
+  font-size: 13px;
+  color: var(--text-tertiary);
+  margin: 8px auto 0;
+  max-width: 400px;
+}
+
+.sheets-summary {
+  background: var(--card);
+  border: 1px solid var(--border-default);
+  border-radius: var(--radius-lg);
+  padding: 16px 18px;
+  margin: 16px 0 18px;
+  display: flex;
+  gap: 18px;
+  flex-wrap: wrap;
+  font-size: 13px;
+  color: var(--text-secondary);
+}
+.summary-stat { display: flex; flex-direction: column; gap: 2px; min-width: 100px; }
+.summary-stat-value {
+  font-size: 22px;
+  font-weight: 600;
+  color: var(--text-primary);
+  font-variant-numeric: tabular-nums;
+}
+.summary-stat-value.problem { color: #b91c1c; }
+.summary-stat-value.ok { color: #16a34a; }
+.summary-stat-label {
+  font-size: 11px;
+  text-transform: uppercase;
+  letter-spacing: 0.05em;
+  color: var(--text-tertiary);
+}
+
+.detected-sheets {
+  margin-left: auto;
+  display: flex;
+  flex-wrap: wrap;
+  gap: 6px;
+  align-self: center;
+}
+.sheet-pill {
+  display: inline-flex;
+  align-items: center;
+  gap: 4px;
+  padding: 3px 9px;
+  border-radius: 999px;
+  font-size: 11.5px;
+  background: var(--bg-tertiary);
+  color: var(--text-secondary);
+}
+.sheet-pill.vv { background: rgba(34, 197, 94, 0.14); color: #15803d; font-weight: 500; }
+.sheet-pill.vv-noprice { background: rgba(245, 158, 11, 0.15); color: #b45309; font-weight: 500; }
+.sheet-pill.not-vv { color: var(--text-quaternary); }
+.empty-state a { color: var(--primary); }
+
+.incs-wrap {
+  display: flex;
+  flex-direction: column;
+  gap: 10px;
+}
+.inc-card {
+  background: var(--card);
+  border: 1px solid var(--border-default);
+  border-radius: var(--radius-lg);
+  padding: 14px 18px;
+  border-left: 4px solid #f59e0b;
+}
+.inc-card-title {
+  font-size: 14px;
+  font-weight: 600;
+  color: var(--text-primary);
+  margin-bottom: 6px;
+}
+.inc-card-meta {
+  font-size: 12px;
+  color: var(--text-tertiary);
+  margin-bottom: 8px;
+}
+.inc-table { width: 100%; border-collapse: collapse; font-size: 13px; }
+.inc-table th, .inc-table td {
+  padding: 6px 10px;
+  border-bottom: 1px solid var(--border-default);
+  text-align: left;
+}
+.inc-table th {
+  font-size: 11px;
+  font-weight: 600;
+  text-transform: uppercase;
+  letter-spacing: 0.04em;
+  color: var(--text-tertiary);
+  background: var(--bg-secondary);
+}
+.inc-table td.num { text-align: right; font-variant-numeric: tabular-nums; }
+.inc-table tr.row-max td { color: #b91c1c; font-weight: 500; }
+.inc-table tr.row-min td { color: #15803d; }
+
+.empty-state {
+  background: var(--card);
+  border: 1px solid var(--border-default);
+  border-radius: var(--radius-lg);
+  padding: 40px 24px;
+  text-align: center;
+  color: var(--text-secondary);
+}
+.empty-state .empty-icon {
+  width: 48px;
+  height: 48px;
+  color: #16a34a;
+  margin: 0 auto 14px;
+}
+
+/* Back link */
+.back-link {
+  display: inline-flex; align-items: center; gap: 6px;
+  padding: 6px 12px 6px 10px; border-radius: 8px;
+  font-size: 13px; font-weight: 500; color: var(--text-tertiary);
+  text-decoration: none; border: 0.5px solid var(--border-default);
+  background: var(--bg-primary); flex-shrink: 0;
+  transition: color .15s, border-color .15s, background .15s;
+}
+.back-link:hover {
+  color: var(--primary); border-color: var(--primary);
+  background: color-mix(in srgb, var(--primary) 6%, var(--bg-primary));
+}
+.back-link svg { opacity: 0.8; }
+@media (max-width: 640px) {
+  .back-link span { display: none; }
+  .back-link { padding: 6px; }
+}