* fix: parse dynamic module arguments consistently

[baocang]

Summary

• support both --key=value and --key value for dynamic module parameters
• accumulate repeated flags and preserve dash-leading values
• coerce bare flags, negative integers, and decimal values consistently
• recognize only plain decimal object IDs
• reject malformed --data and positional JSON instead of silently dropping the request body
• pass dynamic arguments through the generic get command

Verification

• bun run typecheck
• bun test (192 tests)
• bun run build
• git diff --check