fix: type error in config

[takatost]

Description

fix: type error in config of SMTP_PORT, ORACLE_PORT, PGVECTOR_PORT, PGVECTO_RS_PORT, TIDB_VECTOR_PORT.

fixes #5640

Type of Change

• [x] Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

• [x] Manual test

Suggested Checklist:

• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] My changes generate no new warnings
• [x] I ran dev/reformat(backend) and cd web && npx lint-staged(frontend) to appease the lint gods
• [ ] optional I have made corresponding changes to the documentation
• [ ] optional I have added tests that prove my fix is effective or that my feature works
• [ ] optional New and existing unit tests pass locally with my changes