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

dwg-rooms/excel_export.py

@@ -0,0 +1,48 @@
+"""Export room list to a styled Excel workbook."""
+from openpyxl import Workbook
+from openpyxl.styles import Alignment, Border, Font, PatternFill, Side
+from openpyxl.utils import get_column_letter
+
+
+def export_to_excel(rooms: list[dict], output_path: str) -> None:
+    wb = Workbook()
+    ws = wb.active
+    ws.title = "Místnosti"
+
+    hdr_fill = PatternFill("solid", fgColor="155AEF")
+    hdr_font = Font(bold=True, color="FFFFFF", size=10)
+    hdr_align = Alignment(horizontal="center", vertical="center")
+    row_border = Border(
+        bottom=Side(style="thin", color="D0D5DC"),
+        right=Side(style="thin", color="D0D5DC"),
+    )
+    alt_fill = PatternFill("solid", fgColor="F9FAFB")
+
+    headers = ["Č. místnosti", "Popis / účel", "Zdroj", "Spolehlivost"]
+    widths = [16, 52, 14, 16]
+
+    for col, (hdr, w) in enumerate(zip(headers, widths), 1):
+        c = ws.cell(row=1, column=col, value=hdr)
+        c.font = hdr_font
+        c.fill = hdr_fill
+        c.alignment = hdr_align
+        ws.column_dimensions[get_column_letter(col)].width = w
+
+    ws.row_dimensions[1].height = 22
+    ws.freeze_panes = "A2"
+
+    for row_num, room in enumerate(sorted(rooms, key=lambda r: str(r.get("room", ""))), 2):
+        values = [
+            room.get("room", ""),
+            room.get("description", ""),
+            "Pravidla" if room.get("source") == "rule" else "AI",
+            f"{room.get('confidence', 1.0) * 100:.0f} %",
+        ]
+        for col, val in enumerate(values, 1):
+            c = ws.cell(row=row_num, column=col, value=val)
+            c.alignment = Alignment(vertical="center")
+            c.border = row_border
+            if row_num % 2 == 0:
+                c.fill = alt_fill
+
+    wb.save(output_path)