Rename `injectDB.ts` to `inject-db.ts`

[rak3rman]

Simple refactor. Rename src/utils/injectDB.ts to src/utils/inject-db.ts.

Acceptance Criteria

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• [ ] Scenario: Rename injectDB.ts to inject-db.ts
  • Given the file src/utils/injectDB.ts exists
  • When the file is renamed to src/utils/inject-db.ts
  • Then the file should be successfully renamed and the new file name should be src/utils/inject-db.ts