implement Cypress end-to-end testing for APAP and MCP smoke coverage

[ibrahimmahdy684]

This PR implements Cypress-based end-to-end testing for APAP and MCP server behavior, focused on first-pass smoke coverage through real HTTP flows.

Implementation details

1. Added Cypress configuration for server-level E2E execution at cypress.config.ts
2. Added smoke tests at apap-mcp-smoke.cy.ts.
3. Added E2E scripts in package.json: test:e2e, test:e2e:open, test:e2e:local
4. Isolated Cypress from main TypeScript build in tsconfig.json to avoid type-scope conflicts.
5. Added Cypress artifact ignores in .gitignore.

Coverage implemented in this PR

1. APAP smoke check:( Capabilities endpoint returns expected response.)
2. MCP smoke check:( Invalid request without valid session is rejected with expected error response.)

Validation run

1. npm test
2. npm run test:e2e:local

closes #147

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