Migrate remaining scheduled jobs to centralized scheduler

[bokelley]

Background

PR #714 introduced a centralized JobScheduler class in server/src/addie/jobs/scheduler.ts to manage scheduled background jobs. Currently it handles:

• Document indexer (hourly)
• Summary generator (daily)

Remaining Jobs to Migrate

The following jobs are still defined inline in server/src/http.ts and should be migrated to the scheduler:

1. Content curator - Curates and processes content
2. Feed fetcher - Fetches RSS/Atom feeds
3. Alert processor - Processes scheduled alerts
4. Task reminder - Sends task reminders
5. Engagement scoring - Updates engagement scores
6. Goal follow-up - Follows up on goals

Benefits of Migration

• Centralized job management in one place
• Easier to add new jobs following established pattern
• Consistent logging with job-scheduler module tag
• Cleaner http.ts file
• Foundation for future job management features (pause/resume, admin visibility)

Implementation Notes

Each job should follow the existing pattern:

• Initial delay on startup (staggered to avoid thundering herd)
• Periodic interval
• Proper error handling with logging
• Start/stop methods on the scheduler class

Acceptance Criteria

• All scheduled jobs moved to scheduler.ts
• Jobs removed from http.ts
• Existing tests pass
• Job timing/intervals unchanged