Add matrixbot source to repo

All bot source files from LXC 151 (/opt/matrixbot) are now tracked here.
Secrets (.env, credentials.json), venv dirs, and runtime state files
(nio_store, welcome_state.json, wordle_stats.json) are excluded via .gitignore.
Includes deploy.sh to sync files to /opt/matrixbot and restart the service.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

matrixbot/.gitignore

@@ -0,0 +1,22 @@
+# Python venv
+bin/
+lib/
+lib64
+include/
+pyvenv.cfg
+__pycache__/
+*.pyc
+*.pyo
+
+# Secrets — never commit these
+.env
+credentials.json
+
+# Runtime state
+logs/
+nio_store/
+welcome_state.json
+wordle_stats.json
+
+# Stale copy
+app/