improve: Prompt for venv creation before system install fallback

**Context:**
PR #163 fixed critical venv detection bugs but used aggressive
--break-system-packages flag as immediate fallback.

**Improvement:**
Now when no venv is found, the script:
1. Warns user about missing virtual environment
2. Offers to create one automatically (y/n prompt)
3. If yes: Creates venv, activates it, proceeds safely
4. If creation fails: Falls back to system install with warning
5. If no: Proceeds with system install but shows clear warning

**Benefits:**
- Encourages best practices (venv usage)
- Less aggressive about bypassing system protections
- Still supports system install when needed
- Better user experience with clear choices

**Backward Compatibility:**
- All three original scenarios still work
- Only adds new prompt in "no venv" scenario
- Default behavior unchanged for existing venv users

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

setup_mcp.sh

@@ -46,8 +46,30 @@ elif [[ -d "venv" ]]; then
     source venv/bin/activate
     PIP_INSTALL_CMD="pip install"
 else
-    echo "No virtual environment found. Using system pip with --user --break-system-packages flags"
-    PIP_INSTALL_CMD="pip3 install --user --break-system-packages"
+    echo -e "${YELLOW}⚠${NC} No virtual environment found"
+    echo "It's recommended to use a virtual environment to avoid conflicts."
+    echo ""
+    read -p "Would you like to create one now? (y/n) " -n 1 -r
+    echo ""
+
+    if [[ $REPLY =~ ^[Yy]$ ]]; then
+        echo "Creating virtual environment..."
+        python3 -m venv venv || {
+            echo -e "${RED}❌ Failed to create virtual environment${NC}"
+            echo "Falling back to system install..."
+            PIP_INSTALL_CMD="pip3 install --user --break-system-packages"
+        }
+
+        if [[ -d "venv" ]]; then
+            source venv/bin/activate
+            PIP_INSTALL_CMD="pip install"
+            echo -e "${GREEN}✓${NC} Virtual environment created and activated"
+        fi
+    else
+        echo "Proceeding with system install (using --user --break-system-packages)..."
+        echo -e "${YELLOW}Note:${NC} This may override system-managed packages"
+        PIP_INSTALL_CMD="pip3 install --user --break-system-packages"
+    fi
 fi
 
 echo "This will install: mcp, requests, beautifulsoup4"