Add Discord-native hybrid front-end for Jarvis (bot + bridge)

Transform isair/jarvis into a Discord-controlled voice assistant running on
the Ubuntu VNC desktop, keeping the mature ~39k-line Python brain intact.

- bot/ (Node + bun, discord.js): /자비스 slash commands (ephemeral),
  voice channel join + voice receive/playback, pluggable VNC screen broadcast
  (selfbot live / noVNC / screenshot)
- bridge/ (Python, Flask): wraps jarvis STT + run_reply_engine + Piper TTS
  behind a thin localhost HTTP API
- .env.example, scripts/ (start_bridge/start_bot/dev), README rewrite,
  docs/language-comparison.md and docs/vnc-xfce-setup.md

Language decision: hybrid (Python brain + Node/bun Discord layer) because
Discord blocks bot video; native screen broadcast only works via a Node
selfbot library.

tests/tools/builtin/nutrition/test_delete_meal.py

@@ -0,0 +1,59 @@
+"""Tests for delete meal tool."""
+
+import pytest
+from unittest.mock import Mock
+
+from src.jarvis.tools.builtin.nutrition.delete_meal import DeleteMealTool
+from src.jarvis.tools.base import ToolContext
+from src.jarvis.tools.types import ToolExecutionResult
+
+
+class TestDeleteMealTool:
+    """Test delete meal tool functionality."""
+    
+    def setup_method(self):
+        """Set up test fixtures."""
+        self.tool = DeleteMealTool()
+        self.context = Mock(spec=ToolContext)
+        self.context.user_print = Mock()
+        self.context.db = Mock()
+    
+    def test_tool_properties(self):
+        """Test tool metadata properties."""
+        assert self.tool.name == "deleteMeal"
+        assert "delete" in self.tool.description.lower()
+        assert self.tool.inputSchema["type"] == "object"
+        assert "id" in self.tool.inputSchema["required"]
+    
+    def test_run_success(self):
+        """Test successful meal deletion."""
+        self.context.db.delete_meal.return_value = True
+        
+        args = {"id": 123}
+        result = self.tool.run(args, self.context)
+        
+        assert isinstance(result, ToolExecutionResult)
+        assert result.success is True
+        assert "Meal deleted" in result.reply_text
+        self.context.db.delete_meal.assert_called_once_with(123)
+    
+    def test_run_failure(self):
+        """Test meal deletion failure."""
+        self.context.db.delete_meal.return_value = False
+        
+        args = {"id": 999}
+        result = self.tool.run(args, self.context)
+        
+        assert isinstance(result, ToolExecutionResult)
+        assert result.success is False
+        assert "couldn't delete" in result.reply_text.lower()
+    
+    def test_run_invalid_id(self):
+        """Test deletion with invalid ID."""
+        args = {"id": "not_a_number"}
+        result = self.tool.run(args, self.context)
+        
+        assert isinstance(result, ToolExecutionResult)
+        assert result.success is False
+        # Should not call db.delete_meal with invalid ID
+        self.context.db.delete_meal.assert_not_called()