Manage external site-prober actions va API and Dashboard

internal/db/migrations/0004_inbound_checks_admin.sql

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+-- Support for admin-API-configurable prober check types (see docs/USAGE.md,
+-- "Управление типами проверок пробера"). Previously orchestrator.inbound_checks
+-- was a YAML-only value baked into the process at startup.
+
+-- Singleton row, deliberately separate from `settings`: unlike
+-- fip_settle_seconds, inbound checks need no cross-field validation against
+-- other orchestrator config, and ports is a list rather than a scalar, so it
+-- doesn't fit the "add a column to settings" guidance left in
+-- 0003_fip_settle_delay.sql.
+CREATE TABLE inbound_checks_settings (
+  id         INTEGER PRIMARY KEY CHECK (id = 1),
+  ports      TEXT NOT NULL,   -- JSON array of int, e.g. "[22,80,443,8080]"
+  icmp       BOOLEAN NOT NULL DEFAULT 0,
+  created_at TIMESTAMP NOT NULL,
+  updated_at TIMESTAMP NOT NULL
+);