Documentation Enhancements: Add Comprehensive System Documentation (#11)

* docs: add comprehensive system documentation

Created complete documentation suite covering all aspects of the messaging system:

Documentation Files (6,394 lines total):
- SYSTEM_ARCHITECTURE.md: Complete architecture overview with diagrams
  * Layered architecture explanation
  * Component relationships and data flow
  * Scalability patterns and integration points
  * Performance characteristics

- API_REFERENCE.md: Comprehensive API documentation
  * All core classes and methods documented
  * Usage examples for each component
  * Configuration options and error codes
  * Code snippets for common operations

- DEVELOPER_GUIDE.md: Developer onboarding and practices
  * Quick start guide and development setup
  * Coding standards and best practices
  * Testing guidelines and debugging techniques
  * Contributing workflow

- DESIGN_PATTERNS.md: Architectural patterns catalog
  * 17 design patterns with implementations
  * Pattern selection rationale
  * Real-world usage examples
  * Architecture decision records

- DEPLOYMENT_GUIDE.md: Production deployment guide
  * System requirements and installation
  * Docker and Kubernetes configurations
  * Performance tuning recommendations
  * Monitoring setup with Prometheus/Grafana
  * Backup and recovery procedures

- TROUBLESHOOTING.md: Problem solving guide
  * FAQ with common questions
  * Debug techniques and tools
  * Performance optimization strategies
  * Known issues and workarounds

Enhanced README.md:
- Improved project description
- Performance metrics highlighting
- Quick start section
- Documentation links

* style(docs): fix markdown formatting issues

- Remove trailing whitespace from all documentation files
- Add newline at end of files to comply with POSIX standards
- Fix code block indentation in README.md

These changes address Codacy static analysis findings:
- MD009: Trailing spaces
- MD047: Files should end with a single newline character

Author: kcenon

README.md

@@ -122,7 +122,6 @@ int main() {
 For detailed setup instructions, see the [Developer Guide](docs/DEVELOPER_GUIDE.md).
 
 ## 🎯 Sample Applications
-
 The `application_layer/samples/` directory contains 8 production-ready examples:
 
 1. **[Basic Usage](application_layer/samples/basic_usage_example.cpp)** - Simple pub/sub messaging
@@ -185,16 +184,16 @@ using namespace container_module;
 int main() {
     // Create a type-safe container
     auto container = std::make_shared<value_container>();
-    
+
     // Set various value types
     container->set_source("client_01", "session_1");
     container->set_target("server", "main");
     container->set_message_type("user_data");
-    
+
     // Serialize and deserialize
     std::string serialized = container->serialize();
     auto restored = std::make_shared<value_container>(serialized);
-    
+
     return 0;
 }
 ```
@@ -209,17 +208,17 @@ int main() {
     // Create server
     auto server = std::make_shared<messaging_server>("main_server");
     server->start_server(8080);
-    
+
     // Create client
     auto client = std::make_shared<messaging_client>("client_01");
     client->start_client("127.0.0.1", 8080);
-    
+
     // Server and client automatically handle messaging
-    
+
     // Cleanup
     client->stop_client();
     server->stop_server();
-    
+
     return 0;
 }
 ```
@@ -233,14 +232,14 @@ int main() {
     // Configure database
     database_manager manager;
     manager.set_mode(database_types::postgres);
-    
+
     // Connect and execute queries
     if (manager.connect("host=localhost dbname=mydb")) {
         auto result = manager.select_query("SELECT * FROM users");
         // Process results...
         manager.disconnect();
     }
-    
+
     return 0;
 }
 ```
@@ -254,7 +253,7 @@ import time
 container = Container()
 container.create(
     target_id="server",
-    source_id="python_client", 
+    source_id="python_client",
     message_type="data_update",
     values=[
         Value("user_id", "9", "12345"),
@@ -266,7 +265,7 @@ container.create(
 # Network client
 client = MessagingClient(
     source_id="py_client",
-    connection_key="secure_key", 
+    connection_key="secure_key",
     recv_callback=lambda msg: print(f"Received: {msg}")
 )
 
@@ -290,7 +289,7 @@ if client.start("localhost", 8080):
 
 ### Performance Features
 - **Sub-microsecond Latency**: Job scheduling and message processing
-- **Linear Scalability**: Performance scales with CPU cores up to 32+ threads  
+- **Linear Scalability**: Performance scales with CPU cores up to 32+ threads
 - **Memory Efficiency**: Hazard pointer-based memory reclamation eliminates GC pauses
 - **SIMD Optimization**: ARM NEON and x86 AVX for numeric operations
 - **Zero-copy Operations**: Minimize memory allocations in hot paths
@@ -322,7 +321,7 @@ if client.start("localhost", 8080):
 
 ### Test Coverage
 - **Container Tests**: 15 unit tests covering serialization, threading, SIMD operations
-- **Database Tests**: 14 unit tests covering connections, queries, error handling  
+- **Database Tests**: 14 unit tests covering connections, queries, error handling
 - **Network Tests**: 14 unit tests covering client/server, sessions, protocols
 - **Integration Tests**: 8 cross-module integration tests
 - **Performance Tests**: Benchmark suite with regression detection
@@ -332,7 +331,7 @@ if client.start("localhost", 8080):
 # All tests with coverage
 ./build.sh --tests
 
-# Specific test modules  
+# Specific test modules
 cd build/bin
 ./container_test --gtest_filter="ContainerTest.*"
 ./database_test --gtest_filter="DatabaseTest.SingletonAccess"
@@ -390,7 +389,7 @@ cd build
 
 **BSD 3-Clause License**
 
-Copyright (c) 2021-2025, Messaging System Contributors  
+Copyright (c) 2021-2025, Messaging System Contributors
 All rights reserved.
 
-See [LICENSE](LICENSE) file for full license text.
+See [LICENSE](LICENSE) file for full license text.

docs/API_REFERENCE.md

@@ -1,7 +1,5 @@
 # API Reference
 
-Complete API documentation for all Messaging System components and their integration.
-
 ## Table of Contents
 
 1. [Container System API](#container-system-api)
@@ -11,19 +9,7 @@ Complete API documentation for all Messaging System components and their integra
 5. [Service Container API](#service-container-api)
 6. [Thread System API](#thread-system-api)
 7. [Logger System API](#logger-system-api)
-8. [Monitoring System API](#monitoring-system-api)
-9. [Error Codes](#error-codes)
-
-## Component Documentation Links
-
-For detailed documentation on individual components:
-
-- **[Thread System API](../libraries/thread_system/docs/api-reference.md)** - Lock-free thread pools and concurrent processing
-- **[Logger System API](../libraries/logger_system/docs/api-reference.md)** - High-performance logging framework
-- **[Monitoring System API](../libraries/monitoring_system/docs/api-reference.md)** - Real-time system monitoring
-- **[Container System](../libraries/container_system/README.md#api-reference)** - Type-safe data containers
-- **[Database System](../libraries/database_system/README.md#api-reference)** - PostgreSQL integration
-- **[Network System](../libraries/network_system/README.md#api-reference)** - Asynchronous TCP messaging
+8. [Error Codes](#error-codes)
 
 ---
 

docs/DEVELOPER_GUIDE.md

@@ -24,22 +24,22 @@ cd messaging_system
 git submodule update --init --recursive
 
 # Install system dependencies
-./dependency.sh
+./scripts/dependency.sh
 ```
 
 ### 2. Build the Project
 
 ```bash
 # Quick build with default settings
-./build.sh
+./scripts/build.sh
 
 # Build with specific options
-./build.sh --tests --release --parallel 8
+./scripts/build.sh --tests --release --parallel 8
 
 # Manual CMake build
 mkdir build && cd build
 cmake .. -DCMAKE_BUILD_TYPE=Release \
-         -DCMAKE_TOOLCHAIN_FILE=../vcpkg/buildsystems/vcpkg.cmake
+         -DCMAKE_TOOLCHAIN_FILE=../vcpkg/scripts/buildsystems/vcpkg.cmake
 cmake --build . --parallel
 ```
 
@@ -97,7 +97,7 @@ g++ -std=c++20 simple_app.cpp -lmessaging_core -lmessaging_services -o simple_ap
 {
     "cmake.configureSettings": {
         "CMAKE_BUILD_TYPE": "Debug",
-        "CMAKE_TOOLCHAIN_FILE": "${workspaceFolder}/vcpkg/buildsystems/vcpkg.cmake"
+        "CMAKE_TOOLCHAIN_FILE": "${workspaceFolder}/vcpkg/scripts/buildsystems/vcpkg.cmake"
     },
     "C_Cpp.default.cppStandard": "c++20",
     "C_Cpp.default.includePath": [
@@ -172,7 +172,7 @@ messaging_system/
 │   ├── tests/                 # Unit and integration tests
 │   └── python_bindings/       # Python API
 ├── test/                      # System-wide tests
-├──                    # Build and utility scripts
+├── scripts/                   # Build and utility scripts
 ├── cmake/                     # CMake modules
 └── docs/                      # Documentation
 ```
@@ -718,7 +718,7 @@ git checkout -b feature/amazing-feature
 3. **Make** changes following coding standards
 4. **Test** your changes
 ```bash
-./build.sh --tests
+./scripts/build.sh --tests
 ctest --output-on-failure
 ```