Fix Inner Product World Level 2: Complete theorem unlock fix

- Add inner_self_eq_zero and inner_self_im_zero to NewTheorem
- Use only full namespace names (LinearAlgebraGame.X) not short aliases
- Fixes "inner_self_eq_zero is not available" and "inner_self_im_zero is not available" errors in regular mode
- All three theorems (inner_self_nonneg, inner_self_eq_zero, inner_self_im_zero) now properly unlocked

Build verified: lake build Game.Levels.InnerProductWorld.Level02 succeeds

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: ZRTMRH

Game/Levels/InnerProductWorld/Level02.lean

@@ -51,7 +51,7 @@ TheoremDoc LinearAlgebraGame.norm_zero_v as "norm_zero_v" in "Inner Product"
 
 NewTactic apply_fun
 
-NewTheorem Real.sq_sqrt Complex.ext LinearAlgebraGame.inner_self_nonneg inner_self_nonneg
+NewTheorem Real.sq_sqrt Complex.ext LinearAlgebraGame.inner_self_nonneg LinearAlgebraGame.inner_self_eq_zero LinearAlgebraGame.inner_self_im_zero
 
 TheoremTab "ℂ"