Add ckp sync alias command

[Copilot]

Adds ckp sync alias — a new subcommand that exports stored code aliases to a shell-sourceable file and wires it into the user's rc file automatically.

This pull request does...

Why ?
Stored code entries support an alias field, but there was no way to materialize those aliases into the shell environment. This command bridges that gap.

How ?

• Adds cmd/sync.go — parent sync command (follows existing add/list pattern)
• Adds cmd/sync_alias.go — reads all Code entries with a non-empty Alias from the store, writes them to ~/.ckp/ckp_aliases as standard shell aliases, then appends a source line to the first rc file found (.zshrc → .bashrc → .bash_profile). Idempotent: duplicate source lines are not added.
• Adds AliasesFileName constant and GetAliasesFilePath() to internal/config/config.go
• Registers sync under the root ckp command

Generated ~/.ckp/ckp_aliases format:

## File generated by ckp. DO NOT EDIT
alias ll='ls -la'
alias greet='echo "hello"'

Appended to rc file (once):

# ckp aliases
source /home/user/.ckp/ckp_aliases

Steps to verify:

1. Add a code entry with an alias: ckp add code 'ls -la' --alias ll --comment "long listing"
2. Run ckp sync alias
3. Verify ~/.ckp/ckp_aliases contains alias ll='ls -la'
4. Verify your rc file (.zshrc/.bashrc) has a source ~/.ckp/ckp_aliases line appended
5. Run again — confirm the source line is not duplicated

** Screenshots (optional)

Warning

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I tried to connect to the following addresses, but was blocked by firewall rules:

• https://api.github.com/repos/elhmn/ckp/releases
  • Triggering command: /tmp/go-build2333104087/b282/cmd.test /tmp/go-build2333104087/b282/cmd.test -test.testlogfile=/tmp/go-build2333104087/b282/testlog.txt -test.paniconexit0 -test.timeout=10m0s rev-�� Pe7xFpvvQ (http block)

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Original prompt

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This section details on the original issue you should resolve

<issue_title>Add ckp sync alias command</issue_title>
<issue_description>The ckp sync alias command will add your alias in a ~/.ckp/ckp_aliases file and reference them in your main rc file</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Add ckp sync alias command #10

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