feat(infra): add PostgreSQL provider switch (soft migration, default SqlServer) + local postgres:17 service

src/GreenHome.Api/appsettings.Development.json

@@ -5,8 +5,12 @@
       "Microsoft.AspNetCore": "Warning"
     }
   },
+  "Database": {
+    "Provider": "SqlServer"
+  },
   "ConnectionStrings": {
-    "Default": "Server=.;Integrated Security=False;Trusted_Connection=True;Encrypt=false;MultipleActiveResultSets=true;Database=GreenHomeDb;"
+    "Default": "Server=.;Integrated Security=False;Trusted_Connection=True;Encrypt=false;MultipleActiveResultSets=true;Database=GreenHomeDb;",
+    "Postgres": "Host=localhost;Port=5432;Database=greenhome;Username=greenhome;Password=greenhome"
   },
   "AvanakVoiceCall": {
     "Token": "A948B776B90CFD919B0EC60929714136CCB49DDB"

src/GreenHome.Api/docker-compose.yaml

@@ -33,7 +33,24 @@ services:
     networks:
       - greenNetwork
 
+  postgres:
+    image: postgres:17-alpine
+    restart: unless-stopped
+    environment:
+      POSTGRES_DB: greenhome
+      POSTGRES_USER: greenhome
+      POSTGRES_PASSWORD: greenhome
+    ports:
+      - "5432:5432"
+    volumes:
+      - pgdata:/var/lib/postgresql/data
+    networks:
+      - greenNetwork
+
 networks:
   serviceNetwork:
     name: greenNetwork
     external: true
+
+volumes:
+  pgdata: