feat(v1.1.1-routes): outbox-routed sync HTTP + dispatch_mode=async

Routes gain `dispatch_mode TEXT NOT NULL DEFAULT 'sync'` (migration
0012). Existing routes default to sync so the migration is
non-breaking. `DispatchMode` enum lands in `picloud-shared`.

The user-routes orchestrator handler now branches:
- `dispatch_mode = async` → write outbox row with `reply_to = None`,
  return `202 Accepted` + `{accepted_at, execution_id}`. Dispatcher
  fires the script in the background; retries / dead-letters via
  the framework from commit 5.
- `dispatch_mode = sync` → register an inbox channel
  (`tokio::sync::oneshot`), write outbox row with `reply_to =
  inbox_id`, `.await` on the receiver with a timeout =
  script.timeout_seconds + 2s buffer. Dispatcher hands the result
  back; orchestrator maps `InboxResult` into the HTTP response per
  the design-notes §3 status-code table (422/502/503/504/507/500).

`InboxRegistry` (orchestrator-core/src/inbox.rs) is the in-process
implementation of `InboxResolver`. Lock-free HashMap of pending
oneshot senders keyed by `inbox_id`. Tests cover register/deliver
round-trip, unknown-id is abandoned, dropped-receiver is abandoned,
explicit cancel. Cluster mode (v1.3+) swaps this for
LISTEN/NOTIFY-keyed lookup behind the same trait.

`OutboxWriter` trait lives in `picloud-shared` so orchestrator-core
can write to the outbox without depending on manager-core (which
would invert the dependency arrow). `PostgresOutboxRepo` implements
both `OutboxRepo` (dispatcher surface) and `OutboxWriter`
(orchestrator surface); the picloud binary clones the same concrete
Arc into both trait views.

The dispatcher's HTTP arm (commit 5 had a stub) now decodes the
`HttpDispatchPayload` off the outbox row, looks up the script,
synthesizes an `ExecRequest`, and runs it through the executor.
Outcome routing reuses the same path as KV triggers — sync HTTP
flows through the inbox, async dispatch gets dropped after
success (or DL'd on exhaustion).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

crates/manager-core/src/app_bootstrap.rs

@@ -82,6 +82,7 @@ async fn seed_into(
             // Accept any method so both `curl /hello` and
             // `curl -d '{"name":"X"}' /hello` work out of the box.
             method: None,
+            dispatch_mode: picloud_shared::DispatchMode::Sync,
         })
         .await?;