feature: Add support for <Characters> field from ComicInfo.xml

Implements full support for the <Characters> field from ComicInfo.xml specification:

Backend changes:
- Added BOOK_METADATA_CHARACTER and BOOK_METADATA_AGGREGATION_CHARACTER database tables
- Created Flyway migration V20251012120000__book_metadata_characters.sql
- Extended BookMetadata, BookMetadataPatch, and SeriesMetadataAggregation models
- Updated ComicInfoProvider to parse <Characters> field
- Added characters to MetadataApplier and MetadataAggregator
- Implemented SearchCondition.Character for filtering
- Added /api/v1/characters REST endpoint

Frontend changes:
- Added characters field to TypeScript types (komga-books.ts, komga-series.ts, komga-search.ts)
- Implemented character filtering in BrowseBooks, BrowseLibraries, and BrowseSeries views
- Added character chips display in BrowseBook, BrowseSeries, and BrowseOneshot views
- Extended EditBooksDialog, EditSeriesDialog, and EditOneshotDialog with characters editing
- Added characters service methods to komga-referential.service.ts
- Added English translations for characters UI labels

Testing:
- Updated TransientBookLifecycleTest and ComicInfoProviderTest

This feature allows users to:
- Import characters from ComicInfo.xml files
- View characters on book/series detail pages
- Filter books and series by characters
- Edit characters metadata manually
- Search for characters across libraries

.gitignore

@@ -54,6 +54,17 @@ application-oauth2.yml
 /benchmark
 /release_notes
 
+# Local Testing
+CHARACTERS_IMPLEMENTATION_SUMMARY.md
+docker-compose.test.yml
+start-test.ps1
+stop-test.ps1
+test-api.ps1
+
+# Local configs
+test-config/
+test-data/
+
 ### Conveyor
 output/
 secret/

komga/Dockerfile.local

@@ -0,0 +1,24 @@
+FROM eclipse-temurin:17-jre
+
+# Install dependencies
+RUN apt-get update && \
+    apt-get install -y wget && \
+    wget "https://github.com/pgaskin/kepubify/releases/latest/download/kepubify-linux-64bit" -O /usr/bin/kepubify && \
+    chmod +x /usr/bin/kepubify && \
+    apt-get clean && \
+    rm -rf /var/lib/apt/lists/*
+
+VOLUME /tmp
+VOLUME /config
+VOLUME /data
+WORKDIR /app
+
+# Copy the JAR file
+COPY build/libs/*.jar app.jar
+
+ENV KOMGA_CONFIGDIR="/config"
+ENV LANG='en_US.UTF-8' LANGUAGE='en_US:en' LC_ALL='en_US.UTF-8'
+
+EXPOSE 25600
+
+ENTRYPOINT ["java", "-Dspring.profiles.include=docker", "-jar", "app.jar", "--spring.config.additional-location=file:/config/"]