Redesigned core functionality, New log level and Improved health check mechanisms

[yosebyte]

This pull request introduces updates to the NodePass project, focusing on improving logging capabilities, enhancing documentation, updating dependencies, and refining core functionality. Key changes include the addition of new log levels, updates to default connection pool capacities, and improvements to health check mechanisms.

Logging Enhancements:

• Added two new log levels, none (disables logging) and event (logs specific events), to the initLogLevel function in cmd/nodepass/main.go. [1] [2]
• Updated documentation to reflect the new log levels in both English (docs/en/configuration.md, docs/en/usage.md) and Chinese (docs/zh/configuration.md, docs/zh/usage.md). [1] [2] [3] [4]

Documentation Improvements:

• Added a detailed table outlining the scope and applicability of URL query parameters for server, client, and master modes in both English (docs/en/configuration.md) and Chinese (docs/zh/configuration.md). [1] [2]
• Enhanced the Chinese API documentation (docs/zh/api.md) with additional details on RESTful API endpoints, authentication, and instance data structures. [1] [2] [3]

Core Functionality Updates:

• Refactored initContext to initBackground in internal/common.go for better initialization logic and added error channel handling.
• Improved health check logic in internal/common.go by introducing PING signals and resetting connection pool errors. [1] [2]
• Replaced commonOnce and commonQueue with a unified commonControl method for streamlined signal handling and health checks.

Dependency Updates:

• Updated versions of conn, logs, and pool dependencies in go.mod to ensure compatibility with the latest features.
• Added conn package import to internal/client.go and utilized TimeoutReader for improved TCP connection handling. [1] [2]

Configuration Changes:

• Reduced the default maximum connection pool capacity from 8192 to 1024 across relevant files (internal/common.go, docs/en/configuration.md, docs/en/usage.md, docs/zh/configuration.md, docs/zh/usage.md). [1] [2] [3] [4] [5]