feat: add apistore

[qiankunli]

Summary by Sourcery

Introduce an API-based storage backend, allowing configuration retrieval from a remote HTTP server, and update related configuration and factory logic to support this new storage type.

New Features:

• Add support for API-based storage backend with configuration options for URL and JSON path.

Enhancements:

• Update storage factory to support API storage type.

Build:

• Bump github.com/tidwall/gjson dependency version.

Documentation:

• Document API storage configuration in mcp-gateway.yaml example.

[sourcery-ai]

Reviewer's Guide

This pull request introduces a new API-based storage backend (APIStore) for configuration, updates the configuration schema and factory logic to support it, and adds related configuration options and dependencies.

File-Level Changes

Change	Details	Files
Introduced APIStore as a new storage backend for configuration via HTTP API.	Added APIStorageConfig struct to configuration schema. Implemented APIStore struct and methods (Create, Get, List, Update, Delete) for remote config retrieval via HTTP and gjson path extraction. Added NewAPIStore constructor and integrated it into the storage factory.	internal/common/config/storage.go internal/mcp/storage/api.go internal/mcp/storage/factory.go
Extended configuration files and environment variables to support API storage backend.	Added api section to storage config in YAML and .env.example for URL and configJSONPath.	configs/mcp-gateway.yaml .env.example
Updated dependency for gjson to support new features required by APIStore.	Bumped github.com/tidwall/gjson from v1.14.4 to v1.18.0 in go.mod and go.sum.	go.mod go.sum

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[sourcery-ai]

Hey @qiankunli - I've reviewed your changes and they look great!

Here's what I looked at during the review

• 🟡 General issues: 3 issues found
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Documentation: all looks good

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[sourcery-ai]

suggestion: Store methods for Create, Update, and Delete are no-ops.

Consider returning an explicit error (e.g., ErrNotSupported) to clearly indicate these operations aren’t supported.

[iFurySt]

LGTM! Thanks!❤️