Add TRPG app with COC7 occupation data import

[JoshuaZ16]

Summary

• Add the trpg-app Vite/React frontend project.
• Add COC7 occupation import pipeline from COC7空白卡CY23Final.xlsx into structured generated JSON.
• Wire character creation to read occupation data through a service boundary for future API/database migration.
• Add validation for imported occupation data and clean up local env/output ignore rules.

Validation

• npm run validate:coc7
• node ./node_modules/typescript/bin/tsc -b
• node ./node_modules/oxlint/bin/oxlint
• npm run build

Notes

• The generated occupation JSON is currently a static seed-style data source. It is structured so it can later be moved behind a backend API/database without rewriting the page flow.

[fennoai]

No issues found in this review. I reviewed the two added product documentation files for broken internal links, stale/incomplete PR context, scope inconsistencies, security-sensitive claims, and actionable documentation risks.