feat(wfe): integrate workflow engine for up, seed, verify, bootstrap

Dispatch `sunbeam up`, `sunbeam seed`, `sunbeam verify`, and
`sunbeam bootstrap` through WFE workflows instead of monolithic
functions. Steps communicate via JSON workflow data and each
workflow is persisted in a per-context SQLite database.

src/workflows/up/steps/platform.rs

@@ -0,0 +1,31 @@
+//! Platform steps: Gitea bootstrap.
+
+use wfe_core::models::ExecutionResult;
+use wfe_core::traits::{StepBody, StepExecutionContext};
+
+use crate::output::step;
+
+/// Run Gitea bootstrap (repos, webhooks, etc.).
+#[derive(Default)]
+pub struct BootstrapGitea;
+
+#[async_trait::async_trait]
+impl StepBody for BootstrapGitea {
+    async fn run(
+        &mut self,
+        _ctx: &StepExecutionContext<'_>,
+    ) -> wfe_core::Result<ExecutionResult> {
+        step("Gitea bootstrap...");
+        crate::gitea::cmd_bootstrap().await
+            .map_err(|e| wfe_core::WfeError::StepExecution(e.to_string()))?;
+        Ok(ExecutionResult::next())
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn bootstrap_gitea_is_default() { let _ = BootstrapGitea::default(); }
+}