Replace patchelf crack with Freeloader LD_PRELOAD approach

- Multi-stage Dockerfile: discover patterns from PMS binary (capstone),
  compile .so with zig (musl), layer onto lscr.io/linuxserver/plex
- Uses LD_PRELOAD instead of patchelf (which corrupts Plex's musl loader)
- Auto-discovery: broad structural patterns with string-anchored fallback
  (//feature) and relationship-based fallback (BITSET_REF within BS_INIT)
- hook.cpp uses __has_include for generated patterns with hardcoded fallbacks
- Custom wrapper.sh (no traffic_logger preload)
- Vendored Freeloader source (github.com/authrequest/Freeloader, AGPL-3.0)
- Removed stale plexmediaserver_crack.so binary
- Supports Plex 1.43.3+ (verified against 1.43.2 and 1.43.3)

Freeloader/plex_relay/pyproject.toml

@@ -0,0 +1,39 @@
+# SPDX-License-Identifier: AGPL-3.0-or-later
+[build-system]
+requires = ["setuptools>=61"]
+build-backend = "setuptools.build_meta"
+
+[project]
+name = "plex-relay"
+version = "0.2.0"
+description = "Reverse-engineered reimplementation of the Plex Media Server RelayController (educational / RE use)."
+readme = "README.md"
+requires-python = ">=3.10"
+license = { text = "AGPL-3.0-or-later" }
+authors = [{ name = "Plex_Patch RE notes" }]
+dependencies = []  # stdlib only
+
+[project.optional-dependencies]
+test = ["pytest>=7"]
+
+[project.scripts]
+plex-relay = "plex_relay.cli:main"
+
+[tool.setuptools.packages.find]
+where = ["src"]
+
+[tool.setuptools.package-data]
+plex_relay = ["py.typed"]
+
+[tool.pytest.ini_options]
+testpaths = ["tests"]
+
+[tool.mypy]
+python_version = "3.10"
+warn_unused_ignores = true
+warn_redundant_casts = true
+disallow_untyped_defs = true
+
+[tool.ruff]
+line-length = 100
+target-version = "py310"