fix(platforms): QR fallback tip uses uv against the running interpreter

The standard Hermes install is a `uv venv`, which ships no `pip` module:
`<venv>/bin/python -m pip install qrcode` fails with "No module named pip"
(the exact console output in #111695). Switch all four QR-fallback tips
(Feishu, WeCom, QQ onboarding, Telegram managed bot) to
`uv pip install --python <sys.executable> qrcode`, the form the in-tree
plugin install hints already use (hindsight, mem0), so the printed command
works as-is and still targets the active profile's interpreter.

Adds the Feishu-surface invariant test from #111696 and tightens the
Telegram test to the working command form.

Co-authored-by: KoNit-K <124019182+KoNit-K@users.noreply.github.com>

plugins/platforms/feishu/adapter.py

@@ -4104,7 +4104,7 @@ def _qr_register_inner(*, initial_domain: str, timeout_seconds: int) -> Optional
         print(f"\n  Scan the QR code above, or open this URL directly:\n  {qr_url}")
     else:
         print(f"  Open this URL in Feishu / Lark on your phone:\n\n  {qr_url}\n")
-        print(f"  Tip: {sys.executable} -m pip install qrcode  to display a scannable QR code here next time")
+        print(f"  Tip: uv pip install --python {sys.executable} qrcode  to display a scannable QR code here next time")
     print()
     result = _poll_registration(
         device_code=begin["device_code"], interval=begin["interval"],

plugins/platforms/wecom/adapter.py

@@ -675,7 +675,7 @@ def qr_scan_for_bot_info(*, timeout_seconds: int = _QR_POLL_TIMEOUT) -> Optional
         print(f"\n  Scan the QR code above, or open this URL directly:\n  {page_url}")
     except Exception:
         print(f"  Open this URL in WeCom on your phone:\n\n  {page_url}\n")
-        print(f"  Tip: {sys.executable} -m pip install qrcode  to display a scannable QR code here next time")
+        print(f"  Tip: uv pip install --python {sys.executable} qrcode  to display a scannable QR code here next time")
     print("\n  Fetching configuration results...", end="", flush=True)
     deadline = time.monotonic() + timeout_seconds
     query_url = f"{_QR_QUERY_URL}?scode={urllib.parse.quote(scode)}"