Fase 3 v1: new qr types, svg export, clipboard, frame text, batch CSV

New static qr types:
- App Link: Android intent:// links (with package + optional browser
  fallback) or a generic custom-scheme URI. iOS Universal Links need no
  special encoding (they're just plain https:// URLs).
- Bluetooth: device name + MAC address. Purely informational, since unlike
  WIFI:/vCard there's no OS-native "scan to pair" convention.

SVG export: already worked (format whitelist/dropdown existed since Fase 1),
verified rather than reimplemented.

Copy-to-clipboard button next to the download button on both qr list tables,
using the Clipboard API against a fetched blob.

Optional frame text label rendered below the qr code via GD after
generation (raster formats only, no-op for svg/eps).

Batch CSV upload (batch_qrcode.php): filename,link rows create dynamic qr
codes with sane defaults, downloadable as a zip. Required refactoring
Qrcode-intchil.php's generation path (previously always redirected/exited
via failure()/success(), which can't run in a loop) into a private
renderAndStore() that throws instead, shared by addQrcode() and the new
addQrcodeBatch(). Qrcode.php's addQrcodeBatch() is a separate, deliberately
duplicated implementation instead, since its generation logic is small
enough that duplication carries less risk than refactoring the working
external-API code path.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

src/forms/qrcode_options.php

@@ -88,6 +88,14 @@ if (QRCODE_GENERATOR === "internal-chillerlan.qrcode") {
                     <option value="eps">EPS</option>
                 </select>
     </div>
+
+    <div class="col-sm-4">
+        <div class="form-group">
+            <label for="frame_text">Frame text</label>
+            <input type="text" name="frame_text" value="" placeholder="e.g. Scan me" maxlength="60" class="form-control" id="frame_text">
+            <small class="form-text text-muted">Optional label rendered below the code. Only applies to PNG/JPEG/GIF, not SVG/EPS.</small>
+        </div>
+    </div>
   </div>
 </div>