feat: add user authentication and protect endpoints with JWT

Added UsersTable to Exposed database schema

Updated KidioRepository interface and implementations for auth methods

Updated Ktor routing, application setup, and integration tests for JWT auth

.idea/.name

@@ -0,0 +1 @@
+Kidio_backend

.idea/codeStyles/Project.xml

@@ -0,0 +1,10 @@
+<component name="ProjectCodeStyleConfiguration">
+  <code_scheme name="Project" version="173">
+    <JetCodeStyleSettings>
+      <option name="CODE_STYLE_DEFAULTS" value="KOTLIN_OFFICIAL" />
+    </JetCodeStyleSettings>
+    <codeStyleSettings language="kotlin">
+      <option name="CODE_STYLE_DEFAULTS" value="KOTLIN_OFFICIAL" />
+    </codeStyleSettings>
+  </code_scheme>
+</component>

.idea/codeStyles/codeStyleConfig.xml

@@ -0,0 +1,5 @@
+<component name="ProjectCodeStyleConfiguration">
+  <state>
+    <option name="USE_PER_PROJECT_SETTINGS" value="true" />
+  </state>
+</component>

.idea/vcs.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
   <component name="VcsDirectoryMappings">
-    <mapping directory="$PROJECT_DIR$" vcs="Git" />
+    <mapping directory="" vcs="Git" />
   </component>
 </project>

build.gradle.kts

@@ -19,11 +19,17 @@ dependencies {
     implementation(ktorLibs.server.config.yaml)
     implementation(ktorLibs.server.core)
     implementation(ktorLibs.server.netty)
+
+    // JWT Authentication (NEU)
+    implementation("io.ktor:ktor-server-auth")
+    implementation("io.ktor:ktor-server-auth-jwt")
+
     implementation(libs.logback.classic)
 
     // JSON-Unterstützung und Serialization
     implementation("io.ktor:ktor-server-content-negotiation-jvm")
     implementation("io.ktor:ktor-serialization-kotlinx-json-jvm")
+
     // postgres
     implementation("org.postgresql:postgresql:42.7.3")
     implementation("org.jetbrains.exposed:exposed-core:0.50.0")
@@ -35,4 +41,5 @@ dependencies {
     // redis
     implementation("redis.clients:jedis:5.1.2")
 
+    implementation("org.jetbrains.exposed:exposed-java-time:0.50.0")
 }