feat: handle bounded self-referential FK seeding

[machado144]

Summary

• add bounded self-reference generation/backfill so nullable self-FKs create roots and non-null self-FKs can seed safely
• expose the shared self-ref depth option across CLI, TUI, and Serve, with CLI table row overrides matching the UI/TUI per-table controls
• add hard self-reference fixtures to Postgres/MySQL compose schemas and document the new controls

Examples

• seedstorm generate --schema schema.yaml --rows 20 --self-ref-depth 2 --table-rows users=200,orders=500
• Workspace, TUI, and CLI now route through the same generation options for consistent behavior.

Tests

• GOCACHE=/tmp/seedstorm-gocache /home/youngestaxe/go/bin/go1.25.10 test ./...
• make test-integration

[github-actions]

⚠️ Invalid PR Title

PR title must follow the Conventional Commits format since we use squash merge:

<type>[optional scope][!]: <description>

Allowed types: feat, fix, docs, style, refactor, test, chore, build, ci, perf, revert

Examples:

• feat: add new feature
• fix(seed): handle null FK gracefully
• feat!: breaking change

[github-actions]

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