feat: initial MCP server for printing markdown to Epson TM-m30

Single tool `print(markdown, title?, timestamp?, qr_urls?, cut?)`. Hand-rolled
line-by-line markdown parser translates headings/bold/code/lists/blockquotes/
HR/links to ESC/POS, then sends raw bytes via TCP to 192.168.0.184:9100.

Mirrors mcp-gemma4 layout (stdio server, single server.py, mcp package).

.gitignore

@@ -0,0 +1,6 @@
+.venv/
+__pycache__/
+*.pyc
+*.egg-info/
+GITEA_API.md
+.backup/