Fix tools directory for pai alias

[maxolasersquad]

The current code adds the alias alias pai='bun <home-dir>/.claude/PAI/Tools/pai.ts'. However the Tools directory is actually TOOLS. This creates a broken alias on Linux.

[Seikilos]

Did you verify everything else works afterwards?

❯ grep -R "Tools" 2>/dev/null | wc -l
533
❯ grep -R "TOOLS" 2>/dev/null | wc -l
309

There are a lot of casing issues right now.
Wouldn't it make more sense to sweep all files and replace TOOLS with Tools?

I really just think of symlinking Tools to TOOLS 😅