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

.gitignore

@@ -0,0 +1,53 @@
+# ── Secrets ──────────────────────────────────────────────────
+# Never commit env files — every subapp keeps its own LiteLLM virtual key
+# in .env. Use .env.example to document the required variables.
+.env
+.env.*
+!.env.example
+
+# ── Build artifacts ──────────────────────────────────────────
+node_modules/
+.next/
+.turbo/
+.vercel/
+.swc/
+__pycache__/
+*.pyc
+*.pyo
+*.egg-info/
+build/
+dist/
+
+# ── Runtime / volumes ────────────────────────────────────────
+# Bind-mounted Docker volumes and tmp work dirs — never commit user data.
+feature-request/data/
+*/tmp/
+
+# ── Test / sample artifacts (kept locally, not in repo) ──────
+# Add specific samples back to the repo deliberately if needed.
+ideas/*.xlsx
+ideas/*.pdf
+dwg-counting/test*.pdf
+dwg-counting/symbol.png
+dwg-counting/*.dwg
+*.png.backup
+
+# ── Local Playwright outputs ─────────────────────────────────
+.playwright-mcp/
+portal-tiles*.png
+portal-cta*.png
+
+# ── OS / editor ──────────────────────────────────────────────
+.DS_Store
+Thumbs.db
+*.swp
+*~
+.idea/
+.vscode/
+
+# ── Logs ─────────────────────────────────────────────────────
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+pnpm-debug.log*