[Feature]: Respect CLAUDE_CONFIG_DIR env var #2553

Problem Description

I'm frustrated when I set supported Claude ENV variables like CLAUDE_CONFIG_DIR, but Context7 ignores it and installs everything into hard-coded home directory ~/.claude and ~/.claude.json.

This clutters the user's home directory and does not respect the XDG Base Directory Specification.

Proposed Solution

When the supported Claude ENV variables are set, Context7 should respect them, and install to that directory instead.

For example

export XDG_CONFIG_HOME="$HOME/.config"
export CLAUDE_CONFIG_DIR="$XDG_CONFIG_HOME/claude"

Then Context7 should install to the correct directory:

~/.config/claude/.claude.json
~/.config/claude/skills/context7-mcp
~/.config/claude/rules/context7.md

See all supported Claude ENV vars

https://code.claude.com/docs/en/env-vars

Alternatives Considered

No response

Priority

Blocking my usage

Additional Context

No response