feat: quick screenshot upload at /upload

- Drop zone: drag and drop files
- Paste: Ctrl+V pastes clipboard screenshots directly
- Browse: file picker button
- Saves to platform/screenshots/ with timestamp filename
- Mounted as volume in frontend container
- Accessible from any device at dash.quadjourney.com/upload

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

frontend-v2/src/routes/(app)/upload/+page.svelte

@@ -0,0 +1,117 @@
+<script lang="ts">
+  let uploading = $state(false);
+  let lastFile = $state('');
+  let dragOver = $state(false);
+
+  async function upload(file: File) {
+    uploading = true;
+    const fd = new FormData();
+    fd.append('file', file);
+    try {
+      const res = await fetch('/upload', { method: 'POST', body: fd, credentials: 'include' });
+      const data = await res.json();
+      lastFile = data.filename || '';
+    } catch { lastFile = 'Error'; }
+    uploading = false;
+  }
+
+  function handleDrop(e: DragEvent) {
+    e.preventDefault();
+    dragOver = false;
+    const file = e.dataTransfer?.files[0];
+    if (file) upload(file);
+  }
+
+  function handlePaste(e: ClipboardEvent) {
+    const items = e.clipboardData?.items;
+    if (!items) return;
+    for (const item of items) {
+      if (item.type.startsWith('image/')) {
+        const file = item.getAsFile();
+        if (file) upload(file);
+        break;
+      }
+    }
+  }
+
+  function handleFileInput(e: Event) {
+    const input = e.target as HTMLInputElement;
+    if (input.files?.[0]) upload(input.files[0]);
+  }
+</script>
+
+<svelte:window onpaste={handlePaste} />
+
+<!-- svelte-ignore a11y_no_static_element_interactions -->
+<div class="upload-page"
+  ondragover={(e) => { e.preventDefault(); dragOver = true; }}
+  ondragleave={() => dragOver = false}
+  ondrop={handleDrop}
+>
+  <div class="upload-zone" class:dragover={dragOver}>
+    {#if uploading}
+      <div class="upload-status">Uploading...</div>
+    {:else if lastFile}
+      <div class="upload-done">
+        <div class="upload-check">Saved</div>
+        <div class="upload-filename">{lastFile}</div>
+        <button class="upload-another" onclick={() => lastFile = ''}>Upload another</button>
+      </div>
+    {:else}
+      <div class="upload-prompt">
+        <div class="upload-icon">
+          <svg width="40" height="40" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.5" stroke-linecap="round"><path d="M21 15v4a2 2 0 01-2 2H5a2 2 0 01-2-2v-4"/><polyline points="17 8 12 3 7 8"/><line x1="12" y1="3" x2="12" y2="15"/></svg>
+        </div>
+        <div class="upload-text">Drop a file, paste a screenshot, or click to upload</div>
+        <label class="upload-btn">
+          Browse files
+          <input type="file" accept="image/*,.pdf,.txt,.md" onchange={handleFileInput} hidden />
+        </label>
+      </div>
+    {/if}
+  </div>
+</div>
+
+<style>
+  .upload-page {
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    min-height: 80vh;
+    padding: 24px;
+  }
+  .upload-zone {
+    width: 100%;
+    max-width: 480px;
+    min-height: 280px;
+    border: 2px dashed rgba(35,26,17,0.15);
+    border-radius: 24px;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    padding: 40px;
+    transition: all 200ms;
+    background: rgba(255,252,248,0.5);
+  }
+  .upload-zone.dragover {
+    border-color: rgba(179,92,50,0.4);
+    background: rgba(255,248,242,0.8);
+  }
+  .upload-prompt { text-align: center; }
+  .upload-icon { color: #8c7b69; margin-bottom: 16px; }
+  .upload-text { color: #5c5046; font-size: 1rem; margin-bottom: 16px; line-height: 1.5; }
+  .upload-btn {
+    display: inline-block; padding: 10px 24px; border-radius: 999px;
+    background: #1e1812; color: white; font-size: 0.88rem; font-weight: 600;
+    cursor: pointer; transition: opacity 160ms;
+  }
+  .upload-btn:hover { opacity: 0.9; }
+  .upload-status { font-size: 1.1rem; color: #5c5046; }
+  .upload-done { text-align: center; }
+  .upload-check { font-size: 1.2rem; font-weight: 700; color: #059669; margin-bottom: 8px; }
+  .upload-filename { font-size: 0.88rem; color: #5c5046; font-family: var(--mono); margin-bottom: 16px; }
+  .upload-another {
+    padding: 8px 18px; border-radius: 999px; border: 1px solid rgba(35,26,17,0.12);
+    background: none; color: #5c5046; font-size: 0.85rem; cursor: pointer;
+  }
+</style>

frontend-v2/src/routes/(app)/upload/+server.ts

@@ -0,0 +1,25 @@
+import { json } from '@sveltejs/kit';
+import type { RequestHandler } from './$types';
+import fs from 'fs';
+import path from 'path';
+
+const UPLOAD_DIR = '/app/screenshots';
+
+export const POST: RequestHandler = async ({ request }) => {
+    const formData = await request.formData();
+    const file = formData.get('file') as File;
+    if (!file) return json({ error: 'No file' }, { status: 400 });
+
+    const timestamp = new Date().toISOString().replace(/[:.]/g, '-').slice(0, 19);
+    const ext = file.name.split('.').pop() || 'png';
+    const filename = `${timestamp}.${ext}`;
+
+    const buffer = Buffer.from(await file.arrayBuffer());
+
+    // Ensure directory exists
+    if (!fs.existsSync(UPLOAD_DIR)) fs.mkdirSync(UPLOAD_DIR, { recursive: true });
+
+    fs.writeFileSync(path.join(UPLOAD_DIR, filename), buffer);
+
+    return json({ ok: true, filename, path: `/app/screenshots/${filename}` });
+};