docs: scrub stale scan + RPC subdomain refs

V1 scan README + both env files referenced subdomains that no longer
resolve (sentrixscan.sentriscloud.com, testnet-scan.sentriscloud.com,
sentrix-rpc.sentriscloud.com, sentrix-api.sentriscloud.com — all 000
on probe). Same drift in apps/landing/.env.example.

Canonical subdomains (per probe + memory project_chain_naming_canonical):

  V1 scan mainnet : scan.sentrixchain.com
  V1 scan testnet : scan-testnet.sentrixchain.com
  V2 scan mainnet : scan.sentriscloud.com
  V2 scan testnet : scan-testnet.sentriscloud.com
  RPC mainnet     : rpc.sentrixchain.com (bare, no /rpc suffix)
  RPC testnet     : testnet-rpc.sentrixchain.com (bare)
  REST mainnet    : api.sentrixchain.com
  REST testnet    : testnet-api.sentrixchain.com

Also fixes the V1 README "Deploy" section: it claimed nginx + ports
3006/3007 (one process per network), reality is single Caddy upstream
on port 3005 serving both subdomains.

Author: satyakwok

apps/landing/.env.example

@@ -1,4 +1,4 @@
 # Sentrix Chain mainnet RPC — used by Stats section to fetch live block data.
 # Defaults to the public production endpoint if unset.
-NEXT_PUBLIC_MAINNET_RPC=https://sentrix-rpc.sentriscloud.com/rpc
+NEXT_PUBLIC_MAINNET_RPC=https://rpc.sentrixchain.com
 NEXT_PUBLIC_MAINNET_CHAIN_ID=7119

apps/scan/.env.example

@@ -14,12 +14,12 @@
 # ── Chain endpoints (public) ────────────────────────────────────────────────
 # Mainnet
 NEXT_PUBLIC_MAINNET_CHAIN_ID=7119
-NEXT_PUBLIC_MAINNET_RPC=https://rpc.sentrixchain.com/rpc
+NEXT_PUBLIC_MAINNET_RPC=https://rpc.sentrixchain.com
 NEXT_PUBLIC_MAINNET_API=https://api.sentrixchain.com
 
 # Testnet
 NEXT_PUBLIC_TESTNET_CHAIN_ID=7120
-NEXT_PUBLIC_TESTNET_RPC=https://testnet-rpc.sentrixchain.com/rpc
+NEXT_PUBLIC_TESTNET_RPC=https://testnet-rpc.sentrixchain.com
 NEXT_PUBLIC_TESTNET_API=https://testnet-api.sentrixchain.com
 
 # Which network users land on by default (mainnet | testnet).

apps/scan/README.md

@@ -72,11 +72,11 @@ Open http://localhost:3000
 
 | Variable | Description | Default |
 |---|---|---|
-| NEXT_PUBLIC_MAINNET_RPC | Mainnet JSON-RPC | sentrix-rpc.sentriscloud.com/rpc |
-| NEXT_PUBLIC_MAINNET_API | Mainnet REST API | sentrix-api.sentriscloud.com |
+| NEXT_PUBLIC_MAINNET_RPC | Mainnet JSON-RPC | https://rpc.sentrixchain.com |
+| NEXT_PUBLIC_MAINNET_API | Mainnet REST API | https://api.sentrixchain.com |
 | NEXT_PUBLIC_MAINNET_CHAIN_ID | Mainnet chain ID | 7119 |
-| NEXT_PUBLIC_TESTNET_RPC | Testnet JSON-RPC | testnet-rpc.sentriscloud.com/rpc |
-| NEXT_PUBLIC_TESTNET_API | Testnet REST API | testnet-api.sentriscloud.com |
+| NEXT_PUBLIC_TESTNET_RPC | Testnet JSON-RPC | https://testnet-rpc.sentrixchain.com |
+| NEXT_PUBLIC_TESTNET_API | Testnet REST API | https://testnet-api.sentrixchain.com |
 | NEXT_PUBLIC_TESTNET_CHAIN_ID | Testnet chain ID | 7120 |
 | NEXT_PUBLIC_DEFAULT_NETWORK | Default network | mainnet |
 
@@ -90,14 +90,14 @@ pnpm build
 
 ### Systemd
 
-```
-Port 3006 (mainnet), Port 3007 (testnet)
-HOSTNAME=127.0.0.1 (bind localhost only, Nginx reverse proxy)
-```
+A single `sentrix-scan.service` runs `pnpm start` from this directory on
+port 3005. Both networks are served by the same process; the network is
+selected per-request via the cookie / `?network=` query / dedicated
+subdomain (Caddy routes both subdomains to the same upstream).
 
-### Nginx
+### Caddy
 
 ```
-sentrixscan.sentriscloud.com → 127.0.0.1:3006
-testnet-scan.sentriscloud.com → 127.0.0.1:3007
+scan.sentrixchain.com         → 127.0.0.1:3005
+scan-testnet.sentrixchain.com → 127.0.0.1:3005
 ```