refactor: Rename mcp-ecosystem to amoylab, mcp-gateway to unla

[iFurySt]

Summary by Sourcery

Migrate project namespace from mcp-ecosystem/mcp-gateway to amoylab/unla, updating all code, config, CI/CD, documentation, and deployment references.

Enhancements:

• Rename Go module path and all import statements to use "github.com/amoylab/unla"
• Update default configuration and data file paths to "/etc/unla" and use "unla.db"
• Change web dashboard package metadata and UI branding to "Unla" and adjust service client name

Build:

• Update Makefile image variables, Dockerfiles, and Helm chart values to new repository and image names

CI:

• Adjust GitHub Actions workflows for docker publishing, release, and Helm chart publication to reference the "amoylab/unla" registry and repo

Deployment:

• Update docker-compose files, Kubernetes manifests, and Helm charts to use updated image names and config paths for "unla"

Documentation:

• Revise README, docs translations, changelogs, and issue templates to reflect new "Unla" project name and repository URLs

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