Refactor: Extract magic numbers as constants and reduce client code duplication

- Created internal/constants package with organized constant files:
  - timeouts.go: All time duration constants (timeouts, intervals, delays)
  - channels.go: Channel buffer size constants
  - limits.go: Numeric limits and configuration values
  - buffers.go: Buffer size constants in bytes

- Replaced all magic numbers throughout codebase with named constants:
  - Time durations (2s, 3s, 5s, 10s, 100ms, 24h) now use descriptive constants
  - Buffer sizes (8KB, 64KB, 1MB) extracted to constants
  - Channel buffer sizes and multipliers
  - Configuration limits (max connections, concurrency, etc.)
  - Health check status codes
  - Percentage calculations

- Reduced code duplication in client implementations:
  - Created CommonClient to share functionality between CatClient, GrepClient, and TailClient
  - All three clients now inherit from CommonClient
  - Eliminated duplicate makeHandler() and makeCommands() methods
  - Simplified client constructors

This refactoring improves code maintainability by centralizing configuration values
and reducing redundant code across similar client implementations.

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