feat(01-02): add /ready endpoint with database connectivity check

- Add GET /ready endpoint that checks database connection
- Returns 200 'ready' when connected, 503 when not
- Update Routes to require DataSource dependency
- Provide dataSourceLayer in Main.scala
- Use 'hikari' prefix for HikariCP config to avoid ZIO config conflict

summercms/resources/application.conf

@@ -5,7 +5,7 @@ server {
   port = ${?SERVER_PORT}
 }
 
-# Database configuration for ZIO config (used by AppConfig)
+# Database configuration for ZIO config (used by AppConfig.DatabaseConfig)
 database {
   host = "localhost"
   host = ${?DB_HOST}
@@ -20,8 +20,8 @@ database {
 }
 
 # HikariCP configuration for Quill DataSource
-# Reads from "database" prefix via Quill.DataSource.fromPrefix
-database {
+# Uses separate prefix to avoid conflict with ZIO config "database" property
+hikari {
   dataSourceClassName = "org.postgresql.ds.PGSimpleDataSource"
   dataSource {
     serverName = "localhost"

summercms/src/Main.scala

@@ -4,6 +4,7 @@ import zio.config.typesafe.TypesafeConfigProvider
 
 import api.Routes
 import _root_.config.{AppConfig as SummerConfig}
+import db.QuillContext
 
 object Main extends ZIOAppDefault {
 
@@ -29,7 +30,11 @@ object Main extends ZIOAppDefault {
       _   <- Console.printLine(banner)
       _   <- Console.printLine(s"       Starting on port ${cfg.server.port}...")
       _   <- Console.printLine("")
-      _   <- Server.serve(Routes.routes).provide(Server.defaultWithPort(cfg.server.port))
+      // Note: Migrations are NOT auto-run. Use CLI to run migrations (Phase 5).
+      _   <- Server.serve(Routes.routes).provide(
+               Server.defaultWithPort(cfg.server.port),
+               QuillContext.dataSourceLayer
+             )
     } yield ()
 
 }

summercms/src/api/HealthRoutes.scala

@@ -1,20 +1,33 @@
 package api
 
+import zio.*
 import zio.http.*
+import javax.sql.DataSource
 
 /** Health check endpoints
   *
-  * Provides basic health check endpoint for load balancers and monitoring systems. The /health
-  * endpoint returns 200 OK when the server is running.
+  * Provides health check endpoints for load balancers and monitoring systems.
   *
-  * Future endpoints:
-  *   - /ready will verify database connectivity
+  * Endpoints:
+  *   - GET /health - Returns 200 OK when server is running (liveness probe)
+  *   - GET /ready - Returns 200 when database is connected, 503 when not (readiness probe)
   */
 object HealthRoutes {
 
-  val routes: Routes[Any, Response] =
+  val routes: Routes[DataSource, Response] =
     Routes(
-      Method.GET / "health" -> Handler.text("ok")
+      // Liveness probe - always 200 if server is running
+      Method.GET / "health" -> Handler.text("ok"),
+      // Readiness probe - checks database connectivity
+      Method.GET / "ready" -> handler {
+        ZIO.serviceWithZIO[DataSource] { ds =>
+          ZIO.attempt {
+            val conn = ds.getConnection
+            conn.close()
+          }.as(Response.text("ready"))
+            .catchAll(_ => ZIO.succeed(Response.status(Status.ServiceUnavailable)))
+        }
+      }
     )
 
 }

summercms/src/api/Routes.scala

@@ -1,6 +1,7 @@
 package api
 
 import zio.http.*
+import javax.sql.DataSource
 
 /** Route composition point
   *
@@ -8,7 +9,7 @@ import zio.http.*
   */
 object Routes {
 
-  val routes: Routes[Any, Response] =
+  val routes: Routes[DataSource, Response] =
     HealthRoutes.routes
 
 }

summercms/src/db/QuillContext.scala

@@ -27,11 +27,12 @@ object QuillContext {
 
   /** DataSource layer from HikariCP configuration
     *
-    * Reads configuration from "database" prefix in application.conf.
+    * Reads configuration from "hikari" prefix in application.conf.
+    * Uses separate prefix from "database" to avoid conflict with ZIO config.
     * HikariCP manages the connection pool.
     */
   val dataSourceLayer: ZLayer[Any, Throwable, DataSource] =
-    Quill.DataSource.fromPrefix("database")
+    Quill.DataSource.fromPrefix("hikari")
 
   /** Quill PostgreSQL context with snake_case naming
     *