fix(webdav): normalize mounted collection paths

[Orinks]

Summary

• Normalize WebDAV hrefs for servers mounted under a path so PKD shows app-relative paths.
• Treat WebDAV root navigation as a valid local client operation without requiring a server-side info lookup.
• Add a WebDAV flow probe for the public DLP test endpoints using PortkeyDrop's client path.

Test Plan

• uv run python -m ruff check scripts\webdav_flow_probe.py tests\test_webdav_flow_probe.py src\portkeydrop\protocols.py tests\test_protocols.py
• uv run python -m ruff format --check scripts\webdav_flow_probe.py tests\test_webdav_flow_probe.py src\portkeydrop\protocols.py tests\test_protocols.py
• uv run python scripts\webdav_flow_probe.py
• uv run python -m pytest

[gitguardian]

⚠️ GitGuardian has uncovered 2 secrets following the scan of your pull request.

Please consider investigating the findings and remediating the incidents. Failure to do so may lead to compromising the associated services or software components.

🔎 Detected hardcoded secrets in your pull request

GitGuardian id	GitGuardian status	Secret	Commit	Filename
33190145	Triggered	Generic Password	a42f401	scripts/webdav_flow_probe.py	View secret
33190145	Triggered	Generic Password	a42f401	scripts/webdav_flow_probe.py	View secret

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