fix: reset version to 0.1.0 baseline; let cz bump own versioning

The manual 0.1.0->0.2.0 bump conflicted with the automated release
workflow, which would have double-bumped to 0.3.0. Version is now driven
solely by `cz bump` from conventional commits (last tag v0.1.0 is the
baseline); CHANGELOG entries are generated at release time.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01NGzHtDvJur9U7ysgRKRUTN

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "intervalsicu-mcp"
-version = "0.2.0"
+version = "0.1.0"
 description = "A Model Context Protocol server for Intervals.icu (FastMCP, native OAuth)"
 readme = { file = "README.md", content-type = "text/markdown" }
 requires-python = ">=3.12"