feat: add VRAMHUB_TEST_MODE — run on any Linux VPS without Nitro enclave

Author: User

.env.example

@@ -31,7 +31,12 @@ VRAMHUB_R2_SECRET_ACCESS_KEY=
 VRAMHUB_SEAL_KEY_SERVER_IDS=0x73d05d62c18d9374e3ea529e8e0ed6161da1a141a94d3f76ae3fe4e99356db75,0xf5d14a81a982144ae441cd7d64b09027f116a468bd36e7eca494f750591623c8
 VRAMHUB_SEAL_THRESHOLD=2
 
-# ── Nitro Enclave (production only) ───────────────────────────────────────────
+# ── Mode ──────────────────────────────────────────────────────────────────────
+# VRAMHUB_TEST_MODE=true   → testnet only, no enclave needed (any Linux VPS)
+# VRAMHUB_NITRO_ENCLAVE=true → production, requires AWS Nitro EC2
+VRAMHUB_TEST_MODE=true             # set false when you have a Nitro enclave
+
+# ── Nitro Enclave (production only — ignored when TEST_MODE=true) ─────────────
 VRAMHUB_NITRO_ENCLAVE=false        # set true on real AWS Nitro EC2
 VRAMHUB_ENCLAVE_PUBKEY=            # hex Ed25519 pubkey from register-enclave
 VRAMHUB_ENCLAVE_OBJECT_ID=         # on-chain enclave object ID