Replace url-encode-password.sh with Python script

The shell version had to pass the password through a shell variable into
a Python subprocess, which is fragile for special characters.

The Python version uses getpass.getpass() which reads directly from the
terminal at the Python level — no shell variable, no quoting issues, no
risk of special characters being mishandled.

https://claude.ai/code/session_01C4jbd3waXG3eKZYbGUjLUQ

url-encode-password.py

@@ -0,0 +1,16 @@
+#!/usr/bin/env python3
+"""URL-encode a camera password for use in an RTSP URL.
+
+Runs entirely locally.  The password is read without echoing via
+getpass — never written to disk, never sent anywhere.
+"""
+
+import getpass
+import urllib.parse
+
+password = getpass.getpass("Password (not echoed): ")
+encoded  = urllib.parse.quote(password, safe="")
+
+print(f"\nURL-encoded: {encoded}")
+print( "\nPaste into .env like:")
+print(f"  CAM_RTSP_<cam>='rtsp://admin:{encoded}@192.168.1.XXX:554/stream1'")