feat(tmux): add lightweight server config with Ctrl+/ prefix and bottom status bar

- Create .tmux-server.conf for remote servers (plugin-free, minimal)
- Prefix key set to Ctrl+/ (C-_) instead of Ctrl+b
- Status bar positioned at bottom with simple catppuccin-inspired theme
- Include all essential keybindings without TPM dependencies
- Add README section with one-liner download/setup instructions

.config/opencode/plugin/package.json

@@ -0,0 +1,9 @@
+{
+  "name": "opencode-plugins",
+  "version": "1.0.0",
+  "description": "OpenCode plugins for dotfiles",
+  "dependencies": {
+    "@opencode-ai/plugin": "^1.0.51",
+    "with-context-mcp": "^3.0.4"
+  }
+}