Remove conflicting keybindings to fix Ctrl+Shift+P Command Palette issue

[Copilot]

This PR fixes a critical usability issue where the Zephyr IDE extension was hijacking VS Code's default Ctrl+Shift+P keyboard shortcut for opening the Command Palette.

Problem

When users pressed Ctrl+Shift+P with the Zephyr IDE extension enabled, instead of opening VS Code's Command Palette, the extension would trigger the zephyr-ide.flash command and display the error message "Run Zephyr IDE: West Update first." This made it impossible to access the Command Palette using the standard keyboard shortcut.

Root Cause

The extension defined conflicting keybindings in package.json:

• zephyr-ide.flash bound to ctrl+shift+p (conflicted with Command Palette)
• zephyr-ide.build bound to ctrl+shift+B (conflicted with VS Code's build shortcut)

Solution

Completely removed the keybindings section from package.json as suggested by the maintainer. This approach:

• ✅ Eliminates all keybinding conflicts with VS Code defaults
• ✅ Allows users to define their own custom keybindings if desired
• ✅ Maintains full functionality - all commands remain accessible via Command Palette
• ✅ Follows VS Code extension best practices by not overriding system shortcuts

Commands Affected

The following commands no longer have default keyboard shortcuts but remain fully functional:

• Zephyr IDE: Build (previously Ctrl+Shift+B)
• Zephyr IDE: Flash (previously Ctrl+Shift+P)

Users can access these commands via:

1. Command Palette (Ctrl+Shift+P → type "Zephyr IDE: Build" or "Zephyr IDE: Flash")
2. Extension UI buttons and menus
3. Custom keybindings if users choose to define them

Testing

• ✅ TypeScript compilation passes
• ✅ ESLint validation passes
• ✅ Extension builds successfully
• ✅ All commands remain accessible via Command Palette

Fixes #178.

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