feat(01-02): create Quill PostgreSQL context with ZIO integration

- Add QuillContext with dataSourceLayer and quillLayer
- Update application.conf for HikariCP-compatible format
- Export combined quillLive layer for database access

summercms/resources/application.conf

@@ -5,6 +5,7 @@ server {
   port = ${?SERVER_PORT}
 }
 
+# Database configuration for ZIO config (used by AppConfig)
 database {
   host = "localhost"
   host = ${?DB_HOST}
@@ -17,3 +18,24 @@ database {
   password = "summercms"
   password = ${?DB_PASSWORD}
 }
+
+# HikariCP configuration for Quill DataSource
+# Reads from "database" prefix via Quill.DataSource.fromPrefix
+database {
+  dataSourceClassName = "org.postgresql.ds.PGSimpleDataSource"
+  dataSource {
+    serverName = "localhost"
+    serverName = ${?DB_HOST}
+    portNumber = 5432
+    portNumber = ${?DB_PORT}
+    databaseName = "summercms"
+    databaseName = ${?DB_NAME}
+    user = "summercms"
+    user = ${?DB_USER}
+    password = "summercms"
+    password = ${?DB_PASSWORD}
+  }
+  # HikariCP pool settings
+  maximumPoolSize = 10
+  connectionTimeout = 30000
+}