fix(security): remove residual Neon/external credentials from appsettings.Development.json

SEC-C-01 gap: Security engineer's Wave 1 fix replaced Neon credentials in
appsettings.json (19 files) but missed 4 appsettings.Development.json files
that still pointed to cloud infrastructure with production credentials.

Changes per service:
- iam-service-net: DB→localhost, Redis→localhost (removed Velik@2026),
  Email SMTP→localhost:1025 (removed Mailgun password)
- membership-service-net: DB→localhost, Redis→localhost
- promotion-service-net: DB→localhost
- storage-service-net: DB→localhost, MinIO→localhost:9000 (removed Velik@2026),
  Redis→localhost

All four files now point exclusively to local Docker Compose services
(postgres-local:5432, redis-local:6379, minio-local:9000).
Production/staging credentials must be injected via environment variables.

CTO review finding: appsettings.Development.json must not contain cloud
credentials. Local dev should always use docker-compose services.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

services/iam-service-net/src/IamService.API/appsettings.Development.json

@@ -30,15 +30,15 @@
         ]
     },
     "ConnectionStrings": {
-        "DefaultConnection": "Host=ep-holy-glitter-a4hongg7-pooler.us-east-1.aws.neon.tech;Port=5432;Database=iam_service;Username=neondb_owner;Password=npg_Ssfy6HKO0cXI;SSL Mode=Require"
+        "DefaultConnection": "Host=localhost;Database=iam_service;Username=goodgo;Password=goodgo-local-2024"
     },
     "IdentityServer": {
         "Authority": "http://localhost:5001"
     },
     "Redis": {
-        "Host": "167.114.174.113",
+        "Host": "localhost",
         "Port": 6379,
-        "Password": "Velik@2026",
+        "Password": "",
         "Database": 0,
         "ConnectTimeout": 5000,
         "SyncTimeout": 5000
@@ -51,12 +51,12 @@
         "RefreshTokenExpiryDays": 7
     },
     "Email": {
-        "SmtpServer": "smtp.mailgun.org",
-        "SmtpPort": 587,
-        "SmtpLogin": "admin@mail.goodgo.us",
-        "SmtpPassword": "a469e9333580ef5dbb141f01e33864ef-51afd2db-6c014754",
+        "SmtpServer": "localhost",
+        "SmtpPort": 1025,
+        "SmtpLogin": "",
+        "SmtpPassword": "",
         "SenderEmail": "verify@mail.goodgo.us",
-        "SenderName": "GoodGo IAM Service",
+        "SenderName": "GoodGo IAM Service (Dev)",
         "BaseUrl": "http://localhost:5001"
     },
     "TwoFactor": {

services/membership-service-net/src/MembershipService.API/appsettings.Development.json

@@ -17,12 +17,12 @@
         }
     },
     "ConnectionStrings": {
-        "DefaultConnection": "Host=ep-holy-glitter-a4hongg7-pooler.us-east-1.aws.neon.tech;Port=5432;Database=membership_service;Username=neondb_owner;Password=npg_Ssfy6HKO0cXI;SSL Mode=Require"
+        "DefaultConnection": "Host=localhost;Database=membership_service;Username=goodgo;Password=goodgo-local-2024"
     },
     "Redis": {
-        "Host": "167.114.174.113",
+        "Host": "localhost",
         "Port": 6379,
-        "Password": "Velik@2026",
+        "Password": "",
         "Database": 0,
         "ConnectTimeout": 5000,
         "SyncTimeout": 5000

services/promotion-service-net/src/PromotionService.API/appsettings.Development.json

@@ -17,7 +17,7 @@
         }
     },
     "ConnectionStrings": {
-        "DefaultConnection": "Host=ep-holy-glitter-a4hongg7-pooler.us-east-1.aws.neon.tech;Port=5432;Database=promotion_service;Username=neondb_owner;Password=npg_Ssfy6HKO0cXI;SSL Mode=Require"
+        "DefaultConnection": "Host=localhost;Database=promotion_service;Username=goodgo;Password=goodgo-local-2024"
     },
     "WalletService": {
         "BaseUrl": "http://localhost:5003",

services/storage-service-net/src/StorageService.API/appsettings.Development.json

@@ -31,7 +31,7 @@
     },
     "AllowedHosts": "*",
     "ConnectionStrings": {
-        "DefaultConnection": "Host=ep-holy-glitter-a4hongg7-pooler.us-east-1.aws.neon.tech;Port=5432;Database=storage_service;Username=neondb_owner;Password=npg_Ssfy6HKO0cXI;SSL Mode=Require"
+        "DefaultConnection": "Host=localhost;Database=storage_service;Username=goodgo;Password=goodgo-local-2024"
     },
     "Storage": {
         "Provider": "minio",
@@ -39,9 +39,9 @@
         "PreSignedUrlExpirationSeconds": 3600,
         "MaxFileSizeBytes": 104857600,
         "MinIO": {
-            "Endpoint": "167.114.174.113:9000",
+            "Endpoint": "localhost:9000",
             "AccessKey": "minioadmin",
-            "SecretKey": "Velik@2026",
+            "SecretKey": "minioadmin",
             "UseSSL": false,
             "Region": "us-east-1"
         },
@@ -60,9 +60,9 @@
         "HealthCheckCacheDurationSeconds": 60
     },
     "Redis": {
-        "Host": "167.114.174.113",
+        "Host": "localhost",
         "Port": 6379,
-        "Password": "Velik@2026",
+        "Password": "",
         "Database": 0,
         "ConnectTimeout": 5000,
         "SyncTimeout": 5000