fix(llm-model-catalog): stop generated files showing as modified

defaultPrices.ts and modelCatalog.ts are generated by scripts/generate.mjs
with JSON.stringify (quoted keys, no trailing commas), but oxfmt reformatted
the checked-in copies (unquoted keys, trailing commas). So every 'turbo run
generate' (e.g. via 'pnpm run db:migrate') left both files dirty with an
identical-data diff.

Exclude the two generated files in .oxfmtrc.json and commit the raw generator
output, matching how other codegen files in the repo are handled. Generation
is now deterministic and a clean no-op.

Author: 1stvamp

.oxfmtrc.json

@@ -22,6 +22,8 @@
     "**/.changeset/",
     "**/dist/",
     "internal-packages/tsql/src/grammar/",
+    "internal-packages/llm-model-catalog/src/defaultPrices.ts",
+    "internal-packages/llm-model-catalog/src/modelCatalog.ts",
     // Maybe turn these on in the future
     "**/*.yaml",
     "**/*.mdx",