chore: bump version to 1.0.4

Docs-only patch release: clarify that `export` resolves `config.yaml`
against the current working directory, and document the `--config`/`-c`
override (with a Windows-path example).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: tanem

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "mt5-pnl-exporter"
-version = "1.0.3"
+version = "1.0.4"
 description = "Exports MT5 deal history on the Windows host where MT5 runs and writes a typed, encrypted snapshot."
 readme = "README.md"
 authors = [