fix(upload): re-implement LimitedStream for Werkzeug 3.x compatibility

- Removes the broken import of LimitedStream from werkzeug.wsgi
- Adds a local, minimal implementation of LimitedStream
- Ensures file upload functionality works on modern versions of Werkzeug

Author: AniruthKarthik

qrtunnel.py

@@ -35,7 +35,34 @@
 
 from streaming_form_data import StreamingFormDataParser
 from streaming_form_data.targets import FileTarget
-from werkzeug.wsgi import LimitedStream
+
+
+# ── LimitedStream (Manual Implementation) ────────────────
+# Werkzeug 3.0.0 removed LimitedStream. Re-implementing a
+# minimal version to ensure upload stability.
+class LimitedStream:
+    def __init__(self, stream, limit):
+        self._stream = stream
+        self._limit = limit
+        self._pos = 0
+
+    def read(self, size=-1):
+        if self._pos >= self._limit:
+            return b""
+        if size < 0 or size > self._limit - self._pos:
+            size = self._limit - self._pos
+        data = self._stream.read(size)
+        self._pos += len(data)
+        return data
+
+    def readline(self, size=-1):
+        if self._pos >= self._limit:
+            return b""
+        if size < 0 or size > self._limit - self._pos:
+            size = self._limit - self._pos
+        data = self._stream.readline(size)
+        self._pos += len(data)
+        return data
 
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