feat(delivery): production deploy over SSH/SFTP/FTP/FTPS (v2 phase A3-5)

The one path that touches a customer's server, and the one the platform cannot
undo. It is human-triggered, confirmed and audited; there is deliberately no
code path from a pipeline run into it (D13).

- deploy_ssh.py: SshDeployer. Release lands in releases/<ts>-<sha7>/, the
  post-deploy command runs with cwd there, and only then does `current` move —
  atomically (relative symlink + mv -T). A failed hook or extraction never moves
  it, so the previous release keeps serving. Host key is pinned on first success
  (TOFU); a mismatch is a hard failure. Prunes to the newest five.
- deploy_ftp.py: FtpDeployer. FTP has no atomic switch and no rollback except a
  backup, so a backup is mandatory: every file about to be overwritten is
  archived under ARTIFACTS_ROOT before anything is uploaded. The artifact is
  extracted, then the build dir (dist/build/public/out) is chosen — a static
  deploy must not publish the repository. Archive members are sanitised: absolute
  paths, `..` and escaping links are refused.
- deploy_target.py: the tester that dispatches on `kind`.
- deploy_service.py + production_deploys (migration a3b4c5d6e7f4) + 4 routes.
  One deploy per project at a time; the org slug must be typed back; the target
  summary reports has_secret, never the secret.

Tests: 499 API (+26) with fake SSH/FTP transports; ruff, mypy, alembic clean.

Report: docs/plan/reports/agent-3-phase-5.md

apps/api/app/infrastructure/repositories/delivery.py

@@ -8,8 +8,10 @@ from sqlalchemy.ext.asyncio import AsyncSession
 from app.domain.base import utcnow
 from app.domain.delivery.models import (
     AppRuntime,
+    DeployStatus,
     PipelineRun,
     PipelineStep,
+    ProductionDeploy,
     Release,
     RunStatus,
     StepStatus,
@@ -18,6 +20,7 @@ from app.infrastructure.db.models_delivery import (
     AppRuntimeRow,
     PipelineRunRow,
     PipelineStepRow,
+    ProductionDeployRow,
     ReleaseRow,
 )
 
@@ -440,11 +443,131 @@ class AppRuntimeRepository:
         await self.session.flush()
 
 
+def _deploy(row: ProductionDeployRow) -> ProductionDeploy:
+    return ProductionDeploy(
+        id=row.id,
+        organization_id=row.organization_id,
+        project_id=row.project_id,
+        kind=row.kind,
+        host=row.host,
+        release_id=row.release_id,
+        target_id=row.target_id,
+        status=row.status,
+        message=row.message,
+        log_tail=row.log_tail,
+        rolled_back_from=row.rolled_back_from,
+        backup_path=row.backup_path,
+        started_at=row.started_at,
+        finished_at=row.finished_at,
+        created_at=row.created_at,
+    )
+
+
+class ProductionDeployRepository:
+    """The production deploy ledger."""
+
+    def __init__(self, session: AsyncSession) -> None:
+        self.session = session
+
+    async def get(self, deploy_id: str) -> ProductionDeploy | None:
+        row = await self.session.get(ProductionDeployRow, deploy_id)
+        return _deploy(row) if row else None
+
+    async def get_for_org(self, organization_id: str, deploy_id: str) -> ProductionDeploy | None:
+        row = await self.session.scalar(
+            select(ProductionDeployRow).where(
+                ProductionDeployRow.id == deploy_id,
+                ProductionDeployRow.organization_id == organization_id,
+            )
+        )
+        return _deploy(row) if row else None
+
+    async def list_for_project(
+        self, *, project_id: str, limit: int = 20
+    ) -> list[ProductionDeploy]:
+        stmt = (
+            select(ProductionDeployRow)
+            .where(ProductionDeployRow.project_id == project_id)
+            .order_by(ProductionDeployRow.created_at.desc())
+            .limit(min(max(limit, 1), 100))
+        )
+        return [_deploy(r) for r in (await self.session.execute(stmt)).scalars()]
+
+    async def active_for_project(self, project_id: str) -> ProductionDeploy | None:
+        """One production deploy per project at a time.
+
+        Two concurrent deploys to the same target would interleave their writes
+        on a shared host, which is exactly the failure FTP has no way to undo.
+        """
+        row = await self.session.scalar(
+            select(ProductionDeployRow)
+            .where(
+                ProductionDeployRow.project_id == project_id,
+                ProductionDeployRow.status.in_(
+                    [DeployStatus.QUEUED.value, DeployStatus.RUNNING.value]
+                ),
+            )
+            .limit(1)
+        )
+        return _deploy(row) if row else None
+
+    async def create(self, deploy: ProductionDeploy) -> ProductionDeploy:
+        row = ProductionDeployRow(
+            id=deploy.id,
+            organization_id=deploy.organization_id,
+            project_id=deploy.project_id,
+            release_id=deploy.release_id,
+            target_id=deploy.target_id,
+            kind=deploy.kind,
+            host=deploy.host,
+            status=deploy.status,
+            message=deploy.message,
+            log_tail=deploy.log_tail,
+            rolled_back_from=deploy.rolled_back_from,
+            backup_path=deploy.backup_path,
+            started_at=deploy.started_at,
+            finished_at=deploy.finished_at,
+            created_at=deploy.created_at,
+        )
+        self.session.add(row)
+        await self.session.flush()
+        return _deploy(row)
+
+    async def finish(
+        self,
+        deploy_id: str,
+        *,
+        status: str,
+        message: str = "",
+        log_tail: str = "",
+        backup_path: str = "",
+    ) -> None:
+        row = await self.session.get(ProductionDeployRow, deploy_id)
+        if row is None:
+            return
+        row.status = status
+        row.message = message[:2_000]
+        row.log_tail = log_tail[-65_536:]
+        if backup_path:
+            row.backup_path = backup_path
+        row.finished_at = utcnow()
+        await self.session.flush()
+
+    async def mark_running(self, deploy_id: str) -> None:
+        row = await self.session.get(ProductionDeployRow, deploy_id)
+        if row is None:
+            return
+        row.status = DeployStatus.RUNNING.value
+        row.started_at = utcnow()
+        await self.session.flush()
+
+
 __all__ = [
     "ACTIVE_STATUSES",
     "AppRuntimeRepository",
     "PipelineRunRepository",
     "PipelineStepRepository",
+    "ProductionDeployRepository",
     "ReleaseRepository",
     "StepStatus",
 ]