The upstream swag CLI (v1.16.2) does not expose a --strict flag, so
warnings about duplicate routes are silently ignored (exit code 0).
With Strict mode, duplicate @router declarations become hard errors
instead of silent overwrites.

This adds a Go wrapper (scripts/apidocgen/swaginit/main.go) that
calls the swag gen.Build() API directly with Strict: true, and
updates generate.sh to use it instead of 'go tool swag init'.

Notable improvements:
- Better generics support (map params, function-scoped types)
- More precise numeric format annotations (float64, int64)
- x-enum-descriptions for richer API docs
- json:omitempty marks fields as optional
- Security fix for CVE-2024-45338 (x/net)
- Swagger output now uses spaces instead of tabs