refactor(build, dependencies): introduce SQLDelight WebWorker setup, update Spring Boot dependencies, and align versions

Configured `sqlite.worker.js` for OPFS-backed SQLite WASM operations in the frontend build pipeline. Added new Spring Boot dependency bundles including secure service configurations. Integrated updated database utilities with enhanced error handling. Removed outdated circuit breaker tests and replaced them with modern unit and integration test setups.

gradle/libs.versions.toml

@@ -52,7 +52,8 @@ hikari = "7.0.2"
 h2 = "2.4.240"
 flyway = "11.19.1"
 redisson = "4.0.0"
-lettuce = "7.2.1.RELEASE"
+# Spring Boot 3.5.x manages Lettuce 6.6.x; keep aligned to avoid binary/API mismatches.
+lettuce = "6.6.0.RELEASE"
 
 # Observability
 micrometer = "1.16.1"
@@ -162,6 +163,7 @@ spring-boot-starter-test = { module = "org.springframework.boot:spring-boot-star
 spring-boot-starter-oauth2-client = { module = "org.springframework.boot:spring-boot-starter-oauth2-client" }
 spring-boot-starter-oauth2-resource-server = { module = "org.springframework.boot:spring-boot-starter-oauth2-resource-server" }
 spring-boot-starter-security = { module = "org.springframework.boot:spring-boot-starter-security" }
+spring-security-test = { module = "org.springframework.security:spring-security-test" }
 spring-boot-starter-webflux = { module = "org.springframework.boot:spring-boot-starter-webflux" }
 spring-boot-starter-json = { module = "org.springframework.boot:spring-boot-starter-json" }
 spring-boot-starter-aop = { module = "org.springframework.boot:spring-boot-starter-aop", version.ref = "springBoot" }
@@ -293,6 +295,10 @@ testing-jvm = [
     "mockk",
     "assertj-core"
 ]
+test-spring = [
+    "spring-boot-starter-test",
+    "spring-security-test"
+]
 spring-boot-service-complete = [
     "spring-boot-starter-web",
     "spring-boot-starter-validation",
@@ -306,6 +312,15 @@ spring-boot-service-complete = [
     "zipkin-reporter-brave",
     "zipkin-sender-okhttp3"
 ]
+
+# Standard dependencies for a "secure" Spring Boot microservice (architecture-approved baseline)
+spring-boot-secure-service = [
+    "spring-boot-starter-web",
+    "spring-boot-starter-actuator",
+    "spring-boot-starter-security",
+    "spring-boot-starter-oauth2-resource-server",
+    "spring-cloud-starter-consul-discovery"
+]
 database-complete = [
     "spring-boot-starter-data-jpa",
     "postgresql-driver",