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/.env.example

@@ -0,0 +1,15 @@
+MATRIX_HOMESERVER=https://matrix.lotusguild.org
+MATRIX_USER_ID=@lotusbot:matrix.lotusguild.org
+MATRIX_ACCESS_TOKEN=
+MATRIX_DEVICE_ID=
+BOT_PREFIX=!
+ADMIN_USERS=@jared:matrix.lotusguild.org
+LOG_LEVEL=INFO
+
+# Integrations
+OLLAMA_URL=http://10.10.10.157:11434
+OLLAMA_MODEL=lotusllm
+MINECRAFT_RCON_HOST=10.10.10.67
+MINECRAFT_RCON_PORT=25575
+MINECRAFT_RCON_PASSWORD=
+COOLDOWN_SECONDS=120