ci(java-on-aws): update dependency schedule and normalize build paths

- Change Renovate dependency update schedule from weekly (Monday) to monthly (first day of month)
- Update unicorn-store-spring build path from ./apps/unicorn-store-spring/ to ./apps/java21/unicorn-store-spring/ for Java 21 variant
- Normalize unicorn-store-spring-java25 build path from ./apps/unicorn-store-spring-java25/ to ./apps/unicorn-store-spring/ to align with directory structure reorganization
- Align CI/CD configuration with recent application structure consolidation

Author: Yuriy Bezsonov

.github/renovate.yml

@@ -1,7 +1,7 @@
 extends:
   - config:base
 schedule:
-  - "before 6am on monday"
+  - "before 6am on the first day of the month"
 regexManagers:
   # Development tools
   - fileMatch:

.github/workflows/ci.yml

@@ -30,7 +30,7 @@ jobs:
       run: java --version
     - name: Build unicorn-store-spring with Maven
       run: mvn -B clean package --file pom.xml --no-transfer-progress
-      working-directory: ./apps/unicorn-store-spring/
+      working-directory: ./apps/java21/unicorn-store-spring/
     - name: Build unicorn-spring-ai-agent with Maven
       run: mvn -B clean package --file pom.xml --no-transfer-progress -DskipTests
       working-directory: ./apps/unicorn-spring-ai-agent/
@@ -70,7 +70,7 @@ jobs:
       run: java --version
     - name: Build unicorn-store-spring with Maven
       run: mvn -B clean package --file pom.xml --no-transfer-progress
-      working-directory: ./apps/unicorn-store-spring-java25/
+      working-directory: ./apps/unicorn-store-spring/
     - name: Build jvm-ai-analyzer with Maven
       run: mvn -B clean package --file pom.xml --no-transfer-progress
       working-directory: ./apps/jvm-analysis-service/