feat(supplier): add 3 OpenRouter deepseek-v4-flash suppliers (deepseek-flash-1/2/3)

Add 3 single-slot suppliers serving deepseek/deepseek-v4-flash via OpenRouter,
increasing concurrent capacity for the independent buyer machines. Same shape
as the kimi replicas: capability llm.text.generate.v1, price 200000 lovelace,
max_output_tokens=262144, max_processing_ms=3600000, OPENAI_TIMEOUT_MS=3600000,
sharing the one OpenRouter key (accepted concurrency ceiling; no 429/backoff).

- deploy/mainnet/docker-compose.supplier-deepseek-flash-{1,2,3}.yml (new)
- buyer/scripts/monitor-wallets.ts: register the 3 replica wallets

Per-instance wallets, .env files, and on-chain adverts are provisioned on the
mainnet host (gitignored); the 3 containers are live and Active on-chain.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

buyer/scripts/monitor-wallets.ts

@@ -104,6 +104,27 @@ const OPERATOR_SOURCES: OperatorSource[] = [
     keyVar: "SUPPLIER_PRIV_KEY_HEX",
     role: "supplier",
   },
+  {
+    label: "supplier-deepseek-flash-1@vector-marketplace",
+    host: "root@91.98.147.172",
+    envPath: "/root/agents-marketplace/supplier/.env.deepseek-flash-1",
+    keyVar: "SUPPLIER_PRIV_KEY_HEX",
+    role: "supplier",
+  },
+  {
+    label: "supplier-deepseek-flash-2@vector-marketplace",
+    host: "root@91.98.147.172",
+    envPath: "/root/agents-marketplace/supplier/.env.deepseek-flash-2",
+    keyVar: "SUPPLIER_PRIV_KEY_HEX",
+    role: "supplier",
+  },
+  {
+    label: "supplier-deepseek-flash-3@vector-marketplace",
+    host: "root@91.98.147.172",
+    envPath: "/root/agents-marketplace/supplier/.env.deepseek-flash-3",
+    keyVar: "SUPPLIER_PRIV_KEY_HEX",
+    role: "supplier",
+  },
   {
     label: "buyer@open-webui",
     host: "open-webui",