fix: resolve P2P data plane decrypt failure and improve test environment

- Fix key derivation in both sdk/agent.go and internal/vl1/noise.go:
  sort public keys before hashing, use shared key for send/recv
- Adjust docker-compose port mappings to 7150-7153 range (within 7000-7200)
- Add GOPROXY env to Dockerfiles for Go module download in restricted networks
- Verified: all 3 clients connect with 2 peers each, zero decrypt errors

docker-compose.yml

@@ -7,7 +7,7 @@ services:
     hostname: server
     privileged: true
     ports:
-      - "7100:10001"
+      - "7150:10001"
     command:
       - sh
       - -c
@@ -67,7 +67,7 @@ services:
     hostname: client1
     privileged: true
     ports:
-      - "7201:7001/udp"
+      - "7151:7001/udp"
     depends_on:
       init:
         condition: service_completed_successfully
@@ -88,7 +88,7 @@ services:
     hostname: client2
     privileged: true
     ports:
-      - "7202:7002/udp"
+      - "7152:7002/udp"
     depends_on:
       init:
         condition: service_completed_successfully
@@ -109,7 +109,7 @@ services:
     hostname: client3
     privileged: true
     ports:
-      - "7203:7003/udp"
+      - "7153:7003/udp"
     depends_on:
       init:
         condition: service_completed_successfully