feat(detection): add centralized protocol detection module

- Created ts/detection module for unified protocol detection
- Implemented TLS and HTTP detectors with fragmentation support
- Moved TLS detection logic from existing code to centralized module
- Updated RouteConnectionHandler to use ProtocolDetector for both TLS and HTTP
- Refactored ACME HTTP parsing to use detection module
- Added comprehensive tests for detection functionality
- Eliminated duplicate protocol detection code across codebase

This centralizes all non-destructive protocol detection into a single module,
improving code organization and reducing duplication between ACME and routing.

ts/detection/models/detection-types.ts

@@ -0,0 +1,102 @@
+/**
+ * Type definitions for protocol detection
+ */
+
+/**
+ * Supported protocol types that can be detected
+ */
+export type TProtocolType = 'tls' | 'http' | 'unknown';
+
+/**
+ * HTTP method types
+ */
+export type THttpMethod = 'GET' | 'POST' | 'PUT' | 'DELETE' | 'PATCH' | 'HEAD' | 'OPTIONS' | 'CONNECT' | 'TRACE';
+
+/**
+ * TLS version identifiers
+ */
+export type TTlsVersion = 'SSLv3' | 'TLSv1.0' | 'TLSv1.1' | 'TLSv1.2' | 'TLSv1.3';
+
+/**
+ * Connection information extracted from protocol detection
+ */
+export interface IConnectionInfo {
+  /**
+   * The detected protocol type
+   */
+  protocol: TProtocolType;
+  
+  /**
+   * Domain/hostname extracted from the connection
+   * - For TLS: from SNI extension
+   * - For HTTP: from Host header
+   */
+  domain?: string;
+  
+  /**
+   * HTTP-specific fields
+   */
+  method?: THttpMethod;
+  path?: string;
+  httpVersion?: string;
+  headers?: Record<string, string>;
+  
+  /**
+   * TLS-specific fields
+   */
+  tlsVersion?: TTlsVersion;
+  sni?: string;
+  alpn?: string[];
+  cipherSuites?: number[];
+}
+
+/**
+ * Result of protocol detection
+ */
+export interface IDetectionResult {
+  /**
+   * The detected protocol type
+   */
+  protocol: TProtocolType;
+  
+  /**
+   * Extracted connection information
+   */
+  connectionInfo: IConnectionInfo;
+  
+  /**
+   * Any remaining buffer data after detection headers
+   * This can be used to continue processing the stream
+   */
+  remainingBuffer?: Buffer;
+  
+  /**
+   * Whether the detection is complete or needs more data
+   */
+  isComplete: boolean;
+  
+  /**
+   * Minimum bytes needed for complete detection (if incomplete)
+   */
+  bytesNeeded?: number;
+}
+
+/**
+ * Options for protocol detection
+ */
+export interface IDetectionOptions {
+  /**
+   * Maximum bytes to buffer for detection (default: 8192)
+   */
+  maxBufferSize?: number;
+  
+  /**
+   * Timeout for detection in milliseconds (default: 5000)
+   */
+  timeout?: number;
+  
+  /**
+   * Whether to extract full headers or just essential info
+   */
+  extractFullHeaders?: boolean;
+}

ts/detection/models/interfaces.ts

@@ -0,0 +1,115 @@
+/**
+ * Interface definitions for protocol detection components
+ */
+
+import type { IDetectionResult, IDetectionOptions } from './detection-types.js';
+
+/**
+ * Interface for protocol detectors
+ */
+export interface IProtocolDetector {
+  /**
+   * Detect protocol from buffer data
+   * @param buffer The buffer to analyze
+   * @param options Detection options
+   * @returns Detection result or null if protocol cannot be determined
+   */
+  detect(buffer: Buffer, options?: IDetectionOptions): IDetectionResult | null;
+  
+  /**
+   * Check if buffer potentially contains this protocol
+   * @param buffer The buffer to check
+   * @returns True if buffer might contain this protocol
+   */
+  canHandle(buffer: Buffer): boolean;
+  
+  /**
+   * Get the minimum bytes needed for detection
+   */
+  getMinimumBytes(): number;
+}
+
+/**
+ * Interface for connection tracking during fragmented detection
+ */
+export interface IConnectionTracker {
+  /**
+   * Connection identifier
+   */
+  id: string;
+  
+  /**
+   * Accumulated buffer data
+   */
+  buffer: Buffer;
+  
+  /**
+   * Timestamp of first data
+   */
+  startTime: number;
+  
+  /**
+   * Current detection state
+   */
+  state: 'detecting' | 'complete' | 'failed';
+  
+  /**
+   * Partial detection result (if any)
+   */
+  partialResult?: Partial<IDetectionResult>;
+}
+
+/**
+ * Interface for buffer accumulator (handles fragmented data)
+ */
+export interface IBufferAccumulator {
+  /**
+   * Add data to accumulator
+   */
+  append(data: Buffer): void;
+  
+  /**
+   * Get accumulated buffer
+   */
+  getBuffer(): Buffer;
+  
+  /**
+   * Get buffer length
+   */
+  length(): number;
+  
+  /**
+   * Clear accumulated data
+   */
+  clear(): void;
+  
+  /**
+   * Check if accumulator has enough data
+   */
+  hasMinimumBytes(minBytes: number): boolean;
+}
+
+/**
+ * Detection events
+ */
+export interface IDetectionEvents {
+  /**
+   * Emitted when protocol is successfully detected
+   */
+  detected: (result: IDetectionResult) => void;
+  
+  /**
+   * Emitted when detection fails
+   */
+  failed: (error: Error) => void;
+  
+  /**
+   * Emitted when detection times out
+   */
+  timeout: () => void;
+  
+  /**
+   * Emitted when more data is needed
+   */
+  needMoreData: (bytesNeeded: number) => void;
+}