Move Color to base; slim services/Types; colocate ICoreTerminal

- Restore Color.ts under common/base/ (not services)
- Add base/ColorTypes (IColor, IColorRGB)
- Add terminal/CoreTerminalTypes (ICoreTerminal, IScrollEvent, XtermListener)
- Add terminal/InputHandlerTypes and input/WindowOptions for handler types
- services/Types.ts: service-only (modes, mouse, osc link, cursor styles)
- Update imports across src, addons, browser; re-export KeyboardResultType removed
- browser tsconfig: exclude unit tests from composite build

Co-authored-by: Daniel Imms <Tyriar@users.noreply.github.com>

addons/addon-image/src/Types.ts

@@ -9,7 +9,8 @@ import { IDisposable, IMarker, Terminal } from '@xterm/xterm';
 import { Attributes, BgFlags, Content, ExtFlags, UnderlineStyle } from 'common/buffer/Constants';
 import type { AttributeData } from 'common/buffer/AttributeData';
 import type { IParams, IDcsHandler, IOscHandler, IApcHandler, IEscapeSequenceParser } from 'common/parser/Types';
-import type { IBufferLine, IExtendedAttrs, IInputHandler } from 'common/services/Types';
+import type { IBufferLine, IExtendedAttrs } from 'common/buffer/CellTypes';
+import type { IInputHandler } from 'common/terminal/InputHandlerTypes';
 import type { ITerminal, ReadonlyColorSet } from 'browser/Types';
 import type { IRenderDimensions } from 'browser/renderer/shared/Types';
 import type { ICoreBrowserService, IRenderService, IThemeService } from 'browser/services/Services';