feat: 统一自动化任务调度配置并增强聊天流恢复

docs/protocols/models/automation-jobs.md

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+# Automation Jobs Model Protocol
+
+## Scope
+
+This document defines the `automation_jobs` data contract used by backend API payloads,
+scheduler computation, and Flutter settings pages.
+
+## Canonical Fields
+
+- `id`: UUID
+- `owner_id`: UUID
+- `title`: string
+- `config`: object
+  - `input_template`: string
+  - `enabled_tools`: string[]
+  - `context`: object
+    - `source`: `latest_chat`
+    - `window_mode`: `day | number`
+    - `window_count`: int
+  - `schedule`: object
+    - `type`: `daily | weekly`
+    - `run_at`: object
+      - `hour`: int (0-23)
+      - `minute`: int (0-59)
+    - `weekdays`: int[] (only for weekly; Monday=1 ... Sunday=7)
+- `timezone`: IANA timezone string
+- `next_run_at`: timestamptz (UTC), scheduler due cursor
+- `last_run_at`: timestamptz | null
+- `status`: `active | disabled`
+- `created_at`: timestamptz
+- `updated_at`: timestamptz
+
+## Scheduling Semantics
+
+- Scheduler scans only by `next_run_at <= now_utc`.
+- Scheduler calculates subsequent `next_run_at` from `config.schedule + timezone`.
+- `run_at` and `schedule_type` top-level columns are deprecated and removed.
+
+## Compatibility Strategy
+
+- Strategy: **migration-required change**.
+- Existing rows must be migrated by backfilling `config.schedule` from legacy
+  `run_at/schedule_type` before dropping those columns.
+- Clients must send schedule data through `config.schedule` only.