feat: phase 7 automation & realtime — scheduled jobs, domain events, SSE

Scheduled jobs (migration 00009): cron expressions + @every descriptors,
in-process scheduler (15s scan, missed-run collapse), signed HTTP POST
delivery (X-Primora-Signature), AES-256-GCM sealed secrets returned once,
run history with status/duration/http-code, manual execution, retention
pruning. Viewer reads, admin/developer writes.

Domain events: publishEvent fans document/object/issue/deploy/job
mutations to realtime subscribers and matching webhooks through one
path. Webhook event filter extended to job.run, document.*, object.*.

Realtime: GET /projects/:id/realtime/stream SSE with 25s keepalives and
?token=/?api_key= auth for EventSource clients.

Automation dashboard page: Schedules tab (CRUD, run history, manual run,
secret-once banner) + Live events tab (live badge, pause/clear). Demo
mode parity. primora jobs:* CLI group, six primora_*_job* MCP tools,
AutomationService in the generated client.

Fixes folded in: gzip middleware buffered SSE flushes (broke EventSource
on both streams — */stream now bypasses compression); event payloads
double-marshaled json.RawMessage as base64; compose hardcoded localhost
trusted origins so non-default ports broke sign-in; frontend auth base
URL baked an absolute localhost instead of resolving /auth on origin.

Verified live: stack up on :8085, signed delivery HMAC-checked at sink,
@every 30s schedule firing, run history rendering, document.created
landing in the live events feed.

Generated with [Devin](https://devin.ai)

Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

apps/backend/db/migrations/00009_scheduled_jobs.sql

@@ -0,0 +1,39 @@
+-- +goose Up
+CREATE TABLE core.scheduled_jobs (
+  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+  project_id UUID NOT NULL REFERENCES core.projects(id) ON DELETE CASCADE,
+  name TEXT NOT NULL,
+  schedule TEXT NOT NULL,
+  url TEXT NOT NULL,
+  secret BYTEA NOT NULL DEFAULT ''::bytea,
+  payload JSONB NOT NULL DEFAULT '{}'::jsonb,
+  enabled BOOLEAN NOT NULL DEFAULT TRUE,
+  last_run_at TIMESTAMPTZ,
+  last_status TEXT NOT NULL DEFAULT '' CHECK (last_status IN ('', 'success', 'failed')),
+  next_run_at TIMESTAMPTZ,
+  created_by_user_id UUID REFERENCES core.users(id) ON DELETE SET NULL,
+  created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+  updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+  UNIQUE (project_id, name)
+);
+
+CREATE INDEX idx_scheduled_jobs_due ON core.scheduled_jobs(next_run_at)
+  WHERE enabled AND next_run_at IS NOT NULL;
+
+CREATE TABLE core.scheduled_job_runs (
+  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+  job_id UUID NOT NULL REFERENCES core.scheduled_jobs(id) ON DELETE CASCADE,
+  status TEXT NOT NULL DEFAULT 'running' CHECK (status IN ('running', 'success', 'failed')),
+  triggered_by TEXT NOT NULL DEFAULT 'schedule' CHECK (triggered_by IN ('schedule', 'manual')),
+  status_code INT,
+  error TEXT NOT NULL DEFAULT '',
+  duration_ms INT,
+  created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+  finished_at TIMESTAMPTZ
+);
+
+CREATE INDEX idx_scheduled_job_runs_job ON core.scheduled_job_runs(job_id, created_at DESC);
+
+-- +goose Down
+DROP TABLE IF EXISTS core.scheduled_job_runs;
+DROP TABLE IF EXISTS core.scheduled_jobs;