fix: Remove unnecessary entries from .dockerignore for cleaner build context

.dockerignore

@@ -80,7 +80,6 @@ backend/node_modules/
 backend/internal/api/tests/data/
 backend/lint*.txt
 backend/fix_*.sh
-backend/codeql-db-*/
 
 # Backend data (created at runtime)
 backend/data/
@@ -208,7 +207,6 @@ playwright.config.js
 # -----------------------------------------------------------------------------
 # Root-level artifacts
 # -----------------------------------------------------------------------------
-coverage/
 coverage.txt
 provenance*.json
 trivy-*.txt