…) (#183)

* feat(bootstrap): implement SystemBootstrapper for runtime binding

This commit introduces SystemBootstrapper, a fluent API class for
centralized system initialization and logger registration at the
application level.

Key features implemented:
- Fluent API with method chaining for expressive configuration
- Factory-based logger registration for lazy initialization
- Default logger and named logger support via GlobalLoggerRegistry
- Initialization and shutdown callback hooks
- RAII support with automatic shutdown on destruction
- Prevention of duplicate initialization/shutdown
- Move semantics support for transferring ownership

API design:
- with_default_logger(factory): Register default logger factory
- with_logger(name, factory): Register named logger factory
- on_initialize(callback): Add initialization hook
- on_shutdown(callback): Add shutdown hook (LIFO order)
- initialize(): Start the system and register all loggers
- shutdown(): Stop the system and clear loggers
- is_initialized(): Query initialization state
- reset(): Clear all configuration and reset state

Thread Safety:
- Configuration methods are NOT thread-safe
- Lifecycle methods use mutex for state protection
- Registered loggers are thread-safe via GlobalLoggerRegistry

RAII guarantees:
- Destructor calls shutdown() if initialized
- Move assignment handles cleanup of current state
- Move constructor transfers ownership without double shutdown

The implementation follows the existing codebase patterns from
global_logger_registry.h and integrates seamlessly with the
runtime binding infrastructure from Issues #174 and #175.

Refs: #176

* test(bootstrap): add comprehensive tests for SystemBootstrapper

This commit adds unit tests covering all aspects of the SystemBootstrapper
implementation, ensuring correctness and proper behavior.

Test categories implemented:

1. Basic Initialization Tests:
   - Initialize with and without default logger
   - Duplicate initialization returns error
   - Shutdown success and idempotency
   - Shutdown before initialize has no effect

2. Fluent API Tests:
   - Method chaining verification
   - Default logger registration via factory
   - Named logger registration via factory
   - Duplicate name overwrites previous factory

3. Callback Execution Tests:
   - Init callbacks executed in registration order
   - Shutdown callbacks executed in reverse order (LIFO)
   - Init callbacks execute after logger registration
   - Shutdown callbacks execute before logger clear

4. RAII Tests:
   - Destructor automatically calls shutdown
   - Registry cleared on destruction

5. Move Semantics Tests:
   - Move construction transfers ownership
   - Move assignment transfers ownership and cleans up
   - Move prevents double shutdown

6. Error Handling Tests:
   - Null factory result returns error
   - Named logger null factory returns error
   - Null callback ignored safely

7. Reset Tests:
   - Reset clears all configuration
   - Reset calls shutdown if initialized
   - Reset allows reinitialization with new config

8. Integration Tests:
   - Complete lifecycle (create, init, use, shutdown)
   - Multiple bootstrappers in sequence

All 28 tests pass successfully.

Refs: #176

* docs(bootstrap): update API reference and changelog for SystemBootstrapper

This commit updates documentation to reflect the new SystemBootstrapper
class introduced in Issue #176.

API Reference updates:
- Added "Bootstrap" section with complete API documentation
- Documented SystemBootstrapper class with all methods:
  - Constructor/Destructor with RAII behavior
  - Fluent configuration API: with_default_logger(), with_logger(),
    on_initialize(), on_shutdown()
  - Lifecycle methods: initialize(), shutdown(), is_initialized(), reset()
- Added comprehensive usage examples including RAII pattern
- Documented thread safety characteristics
- Updated version to 2.2 and updated table of contents

Changelog updates:
- Added entry for SystemBootstrapper under [Unreleased]
- Listed all new features:
  - Factory-based logger registration
  - Default and named logger support
  - Init/shutdown hooks with ordering guarantees
  - RAII support with automatic shutdown
  - Move semantics support
  - Duplicate initialization/shutdown prevention
  - Reset method for reconfiguration

Updated common.h:
- Added include for bootstrap/system_bootstrapper.h
- Added "Bootstrap (Issue #176)" section comment

Refs: #176