refactor(harness): freeze single-agent contracts

.docs/phase1-config-test-final-report.md

@@ -97,7 +97,7 @@ spring:
     redis:
       host: 119.29.78.52
       port: 6379
-      password: '!Fucker123..'
+      password: ${SUPERBIZ_REDIS_PASSWORD}
       database: 0
       timeout: 3000
 ```

.docs/phase1-config-test-report.md

@@ -140,7 +140,7 @@ Error Code: 1049
 datasource:
   url: jdbc:mysql://119.29.78.52:33306/superbiz_agent?...
   username: root
-  password: '!Fucker123..'
+  password: ${SUPERBIZ_MYSQL_PASSWORD}
 ```
 
 **Redis 配置**:
@@ -149,7 +149,7 @@ data:
   redis:
     host: 119.29.78.52
     port: 6379
-    password: '!Fucker123..'
+    password: ${SUPERBIZ_REDIS_PASSWORD}
 ```
 
 **Flyway 配置**: