Add oxlint import/no-cycle and break existing src/common cycles

Enable oxlint's import/no-cycle rule (import plugin) so circular module
dependencies are caught in CI, similar to eslint-plugin-import/no-cycle
and biome no-import-cycles discussed in the issue.

Relocate shared types and dependencies to remove cycles under src/common:

- Types.ts: host IInsertEvent, IDeleteEvent, IParams, UnderlineStyle,
  IBuffer, and IBufferSet; drop imports from CircularList, buffer/Types,
  parser/Types, and Services
- CoreTerminal.ts: define and export ICoreTerminal
- ServiceRegistry.ts: define IServiceIdentifier (break Services registry loop)
- UnicodeService: stop constructing UnicodeV6; CoreTerminal registers the
  default v6 provider after service creation
- buffer/Types.ts and parser/Types.ts: re-export moved types for callers

Fixes https://github.com/xtermjs/xterm.js/issues/5897

Co-authored-by: Cursor <cursoragent@cursor.com>

src/common/parser/Types.ts

@@ -3,12 +3,10 @@
  * @license MIT
  */
 
-import { IDisposable } from '../Types';
+import { IDisposable, IParams, ParamsArray } from '../Types';
 import { ParserState } from './Constants';
 
-
-/** sequence params serialized to js arrays */
-export type ParamsArray = (number | number[])[];
+export type { IParams, ParamsArray };
 
 /** Params constructor type. */
 export interface IParamsConstructor {
@@ -18,28 +16,6 @@ export interface IParamsConstructor {
   fromArray(values: ParamsArray): IParams;
 }
 
-/** Interface of Params storage class. */
-export interface IParams {
-  /** from ctor */
-  maxLength: number;
-  maxSubParamsLength: number;
-
-  /** param values and its length */
-  params: Int32Array;
-  length: number;
-
-  /** methods */
-  clone(): IParams;
-  toArray(): ParamsArray;
-  reset(): void;
-  resetZdm(): void;
-  addParam(value: number): void;
-  addSubParam(value: number): void;
-  hasSubParams(idx: number): boolean;
-  getSubParams(idx: number): Int32Array | null;
-  getSubParamsAll(): {[idx: number]: Int32Array};
-}
-
 /**
  * Internal state of EscapeSequenceParser.
  * Used as argument of the error handler to allow