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-compare/static/app.js

@@ -0,0 +1,130 @@
+// VV compare frontend
+(() => {
+  const $ = (id) => document.getElementById(id);
+  const sections = {
+    upload: $("s-upload"),
+    processing: $("s-processing"),
+    result: $("s-result"),
+  };
+  const show = (n) => {
+    for (const [k, el] of Object.entries(sections)) el.classList.toggle("hidden", k !== n);
+  };
+
+  let state = { jobId: null, result: null, origFile: null, newFile: null };
+
+  function attachDrop(zoneId, inputId, textId, which) {
+    const zone = $(zoneId);
+    const input = $(inputId);
+    const text = $(textId);
+    zone.addEventListener("click", () => input.click());
+    input.addEventListener("change", (e) => {
+      if (e.target.files[0]) setFile(which, e.target.files[0], zone, text);
+    });
+    ["dragenter", "dragover"].forEach((ev) =>
+      zone.addEventListener(ev, (e) => { e.preventDefault(); zone.classList.add("drag-over"); }));
+    ["dragleave", "drop"].forEach((ev) =>
+      zone.addEventListener(ev, (e) => { e.preventDefault(); zone.classList.remove("drag-over"); }));
+    zone.addEventListener("drop", (e) => {
+      if (e.dataTransfer.files[0]) setFile(which, e.dataTransfer.files[0], zone, text);
+    });
+  }
+
+  function setFile(which, file, zone, textEl) {
+    if (which === "orig") state.origFile = file;
+    else state.newFile = file;
+    zone.classList.add("has-file");
+    const size = file.size > 1024 * 1024
+      ? `${(file.size / 1024 / 1024).toFixed(1)} MB`
+      : `${(file.size / 1024).toFixed(0)} kB`;
+    textEl.innerHTML = `<strong>${escapeHtml(file.name)}</strong><br><span style="color:var(--text-tertiary);font-size:12px">${size}</span>`;
+    updateRunBtn();
+  }
+
+  attachDrop("drop-original", "orig-input", "orig-text", "orig");
+  attachDrop("drop-new", "new-input", "new-text", "new");
+
+  function updateRunBtn() {
+    const btn = $("compare-btn");
+    const hint = $("compare-hint");
+    if (!state.origFile && !state.newFile) {
+      btn.disabled = true; hint.textContent = "Nahrajte oba soubory.";
+    } else if (!state.origFile) {
+      btn.disabled = true; hint.textContent = "Chybí původní VV.";
+    } else if (!state.newFile) {
+      btn.disabled = true; hint.textContent = "Chybí nový VV.";
+    } else {
+      btn.disabled = false; hint.textContent = "Připraveno k porovnání.";
+    }
+  }
+
+  $("compare-btn").addEventListener("click", async () => {
+    if (!state.origFile || !state.newFile) return;
+    show("processing");
+    try {
+      const fd = new FormData();
+      fd.append("original", state.origFile);
+      fd.append("new", state.newFile);
+      const r = await fetch("/api/compare", { method: "POST", body: fd });
+      if (!r.ok) throw new Error((await r.json()).detail || r.statusText);
+      const json = await r.json();
+      state.jobId = json.job_id;
+      state.result = json.result;
+      renderResult();
+      show("result");
+    } catch (err) {
+      alert("Chyba: " + err.message);
+      show("upload");
+    }
+  });
+
+  function renderResult() {
+    const r = state.result;
+    const c = r.changes.length, a = r.added.length, d = r.removed.length;
+    $("cnt-changed").textContent = c;
+    $("cnt-added").textContent = a;
+    $("cnt-removed").textContent = d;
+    $("results-meta").textContent =
+      `Porovnání ${r.per_sheet.length} listů — ${c + a + d} celkových rozdílů.`;
+
+    const psHtml = r.per_sheet.map((ps) => `
+      <tr>
+        <td>${escapeHtml(ps.sheet)}</td>
+        <td>${escapeHtml(ps.hala || "")}</td>
+        <td class="num">${ps.orig_count}</td>
+        <td class="num">${ps.new_count}</td>
+        <td class="num"><span class="pill ${ps.changes ? "changed" : "zero"}">${ps.changes}</span></td>
+        <td class="num"><span class="pill ${ps.added ? "added" : "zero"}">${ps.added}</span></td>
+        <td class="num"><span class="pill ${ps.removed ? "removed" : "zero"}">${ps.removed}</span></td>
+      </tr>`).join("");
+    $("per-sheet").innerHTML = r.per_sheet.length ? `
+      <table>
+        <thead>
+          <tr>
+            <th>List</th><th>Hala</th>
+            <th>Pol. původní</th><th>Pol. nový</th>
+            <th>Změněné</th><th>Přidané</th><th>Odebrané</th>
+          </tr>
+        </thead>
+        <tbody>${psHtml}</tbody>
+      </table>` : `<p style="color:var(--text-tertiary)">Nepodařilo se najít listy VV v žádném ze souborů.</p>`;
+  }
+
+  $("download-btn").addEventListener("click", () => {
+    if (state.jobId) window.location.href = `/api/report/${state.jobId}`;
+  });
+  $("restart-btn").addEventListener("click", () => {
+    state = { jobId: null, result: null, origFile: null, newFile: null };
+    $("orig-input").value = ""; $("new-input").value = "";
+    $("drop-original").classList.remove("has-file");
+    $("drop-new").classList.remove("has-file");
+    $("orig-text").textContent = "Přetáhněte soubor sem nebo klikněte";
+    $("new-text").textContent = "Přetáhněte soubor sem nebo klikněte";
+    updateRunBtn();
+    show("upload");
+  });
+
+  function escapeHtml(s) {
+    return String(s ?? "").replace(/[&<>"']/g, (c) =>
+      ({"&":"&amp;","<":"&lt;",">":"&gt;",'"':"&quot;","'":"&#39;"}[c]));
+  }
+})();