[codex] Split site API endpoint pool from panel host (#373)

* feat: add site api endpoint schema scaffolding

* feat: wire site api endpoints into backup migration

* feat: add site api endpoint selection service

* feat: add site api endpoint contracts

* feat: route discovery through site api endpoints

* feat: route proxy traffic through site api endpoints

* feat: add site api endpoint pool editor

* fix: keep proxy video tasks on site endpoint pool

* fix: restore core test compatibility for site endpoint pool

* fix: address endpoint pool review findings

drizzle/0018_site_api_endpoints.sql

@@ -0,0 +1,18 @@
+CREATE TABLE `site_api_endpoints` (
+	`id` integer PRIMARY KEY AUTOINCREMENT NOT NULL,
+	`site_id` integer NOT NULL,
+	`url` text NOT NULL,
+	`enabled` integer DEFAULT true,
+	`sort_order` integer DEFAULT 0,
+	`cooldown_until` text,
+	`last_selected_at` text,
+	`last_failed_at` text,
+	`last_failure_reason` text,
+	`created_at` text DEFAULT (datetime('now')),
+	`updated_at` text DEFAULT (datetime('now')),
+	FOREIGN KEY (`site_id`) REFERENCES `sites`(`id`) ON UPDATE no action ON DELETE cascade
+);
+--> statement-breakpoint
+CREATE UNIQUE INDEX `site_api_endpoints_site_url_unique` ON `site_api_endpoints` (`site_id`,`url`);--> statement-breakpoint
+CREATE INDEX `site_api_endpoints_site_enabled_sort_idx` ON `site_api_endpoints` (`site_id`,`enabled`,`sort_order`);--> statement-breakpoint
+CREATE INDEX `site_api_endpoints_site_cooldown_idx` ON `site_api_endpoints` (`site_id`,`cooldown_until`);

drizzle/meta/_journal.json

@@ -120,6 +120,13 @@
       "when": 1774692431588,
       "tag": "0017_proxy_debug_traces",
       "breakpoints": true
+    },
+    {
+      "idx": 17,
+      "version": "6",
+      "when": 1774959227309,
+      "tag": "0018_site_api_endpoints",
+      "breakpoints": true
     }
   ]
 }