# Task: Add explicit test data seed script

## Goal

Move demo/test data seeding out of API startup and into an explicit script command that can be run intentionally against any configured environment.

## Relevant Files

- `backend/src/Socialize.Api/Program.cs`
- `backend/src/Socialize.Api/Infrastructure/TestData/TestDataSeedExtensions.cs`
- `backend/src/Socialize.Api/appsettings.Development.json`
- `backend/src/Socialize.Api/appsettings.Production.json`
- `scripts/seed-testdata.sh`

## Validation

```bash
dotnet build backend/Socialize.slnx
./scripts/seed-testdata.sh
```