Add Navidrome Scrobbled scrobbler plugin

A Python Extism plugin for Navidrome that scrobbles playback to a
self-hosted Scrobbled (Last.fm-compatible) server, plus Gitea Actions
CI that lints, tests, builds/validates, and publishes the .ndp
artifact to pkgs.daubney.dev.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_018n5ffHCn5QUjpDtuWTk3fh

pyproject.toml

@@ -0,0 +1,18 @@
+[project]
+name = "navidromescrobbledplugin"
+version = "0.1.0"
+requires-python = ">=3.13"
+dependencies = []
+
+[dependency-groups]
+dev = [
+    "ruff>=0.16.9",
+]
+
+[tool.ruff]
+line-length = 100
+target-version = "py313"
+src = ["plugin", "tests"]
+
+[tool.ruff.lint]
+select = ["E", "F", "W", "I", "B", "UP", "SIM"]