Remove unused code (legacy files and heartbeat method)

- Removed unused legacy files: client.ts and types.ts (old API)
- Removed heartbeat() method from offers API (doesn't actually reset TTL)
- Removed heartbeat() documentation from README
- Server only uses expires_at for cleanup, last_seen is never checked
- Offers expire purely based on their original TTL

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

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

src/types.ts

@@ -1,182 +0,0 @@
-// ============================================================================
-// Signaling Types
-// ============================================================================
-
-/**
- * Session side - identifies which peer in a connection
- */
-export type Side = 'offerer' | 'answerer';
-
-/**
- * Request body for POST /offer
- */
-export interface CreateOfferRequest {
-  /** Peer identifier/metadata (max 1024 characters) */
-  peerId: string;
-  /** Signaling data for peer connection */
-  offer: string;
-  /** Optional custom connection code (if not provided, server generates UUID) */
-  code?: string;
-}
-
-/**
- * Response from POST /offer
- */
-export interface CreateOfferResponse {
-  /** Unique session identifier (UUID) */
-  code: string;
-}
-
-/**
- * Request body for POST /answer
- */
-export interface AnswerRequest {
-  /** Session UUID from the offer */
-  code: string;
-  /** Response signaling data (required if candidate not provided) */
-  answer?: string;
-  /** Additional signaling data (required if answer not provided) */
-  candidate?: string;
-  /** Which peer is sending the data */
-  side: Side;
-}
-
-/**
- * Response from POST /answer
- */
-export interface AnswerResponse {
-  success: boolean;
-}
-
-/**
- * Request body for POST /poll
- */
-export interface PollRequest {
-  /** Session UUID */
-  code: string;
-  /** Which side is polling */
-  side: Side;
-}
-
-/**
- * Response from POST /poll when side=offerer
- */
-export interface PollOffererResponse {
-  /** Answer from answerer (null if not yet received) */
-  answer: string | null;
-  /** Additional signaling data from answerer */
-  answerCandidates: string[];
-}
-
-/**
- * Response from POST /poll when side=answerer
- */
-export interface PollAnswererResponse {
-  /** Offer from offerer */
-  offer: string;
-  /** Additional signaling data from offerer */
-  offerCandidates: string[];
-}
-
-/**
- * Response from POST /poll (union type)
- */
-export type PollResponse = PollOffererResponse | PollAnswererResponse;
-
-/**
- * Response from GET / - server version information
- */
-export interface VersionResponse {
-  /** Git commit hash or version identifier */
-  version: string;
-}
-
-/**
- * Response from GET /health
- */
-export interface HealthResponse {
-  status: 'ok';
-  timestamp: number;
-  version: string;
-}
-
-/**
- * Error response structure
- */
-export interface ErrorResponse {
-  error: string;
-}
-
-/**
- * Client configuration options
- */
-export interface RondevuClientOptions {
-  /** Base URL of the Rondevu server (e.g., 'https://example.com') */
-  baseUrl: string;
-  /** Optional fetch implementation (for Node.js environments) */
-  fetch?: typeof fetch;
-}
-
-// ============================================================================
-// WebRTC Types
-// ============================================================================
-
-/**
- * WebRTC polyfill for Node.js and other non-browser platforms
- */
-export interface WebRTCPolyfill {
-  RTCPeerConnection: typeof RTCPeerConnection;
-  RTCSessionDescription: typeof RTCSessionDescription;
-  RTCIceCandidate: typeof RTCIceCandidate;
-}
-
-/**
- * Configuration options for Rondevu WebRTC client
- */
-export interface RondevuOptions {
-  /** Base URL of the Rondevu server (defaults to 'https://api.ronde.vu') */
-  baseUrl?: string;
-  /** Peer identifier (optional, auto-generated if not provided) */
-  peerId?: string;
-  /** Optional fetch implementation (for Node.js environments) */
-  fetch?: typeof fetch;
-  /** WebRTC configuration (ICE servers, etc.) */
-  rtcConfig?: RTCConfiguration;
-  /** Polling interval in milliseconds (default: 1000) */
-  pollingInterval?: number;
-  /** Connection timeout in milliseconds (default: 30000) */
-  connectionTimeout?: number;
-  /** WebRTC polyfill for Node.js (e.g., wrtc or @roamhq/wrtc) */
-  wrtc?: WebRTCPolyfill;
-}
-
-/**
- * Connection role - whether this peer is creating or answering
- */
-export type ConnectionRole = 'offerer' | 'answerer';
-
-/**
- * Parameters for creating a RondevuConnection
- */
-export interface RondevuConnectionParams {
-  id: string;
-  topic?: string;
-  role: ConnectionRole;
-  pc: RTCPeerConnection;
-  localPeerId: string;
-  remotePeerId: string;
-  pollingInterval: number;
-  connectionTimeout: number;
-  wrtc?: WebRTCPolyfill;
-}
-
-/**
- * Event map for RondevuConnection events
- */
-export interface RondevuConnectionEvents {
-  connect: () => void;
-  disconnect: () => void;
-  error: (error: Error) => void;
-  datachannel: (channel: RTCDataChannel) => void;
-  stream: (stream: MediaStream) => void;
-}