chore: update postgres volume mount path in docker-compose

[ilramdhan]

Description

update postgres volume mount path in docker-compose

Type of Change

• 🐛 Bug fix (non-breaking change that fixes an issue)
• ✨ New feature (non-breaking change that adds functionality)
• 💥 Breaking change (fix or feature that changes existing API)
• ♻️ Refactor (code change without new feature or bug fix)
• 📚 Documentation update
• 🧪 Test update
• 🔧 Chore (dependencies, config, etc.)

Service(s) Affected

• Finance Service
• IAM Service
• Shared Proto (gen/)
• Root/Common

Lint & Build

• golangci-lint run ./... passes
• go build ./... succeeds
• go test -race ./... passes

Database (if applicable)

• Migration added
• Migration tested (up and down)
• No breaking schema changes (or documented)

Documentation

• README.md updated (if needed)
• RULES.md updated (if needed)
• Proto comments updated
• OpenAPI regenerated

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Pre-merge Checklist

• I have read and followed RULES.md
• I have read and followed CONTRIBUTING.md
• Clean Architecture principles followed
• All errors are properly handled
• Context is passed appropriately
• Structured logging is used
• No hardcoded secrets
• PR description is complete and clear
• CI checks are passing