refactor: rename cmd/server to cmd/deklarix

Matches the project structure and binary name defined in the Deklarix
product spec.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

scripts/build.sh

@@ -45,7 +45,7 @@ for ARCH in "${ARCHS[@]}"; do
     GOARCH=$ARCH GOOS=linux go build \
         -ldflags="-X main.Version=${VERSION} -s -w" \
         -o "$OUT" \
-        ./cmd/server/
+        ./cmd/deklarix/
     log "$ARCH fertig: $(du -sh "$OUT" | cut -f1)"
 done
 

scripts/test.sh

@@ -22,6 +22,6 @@ log "go test ./... "
 go test -race -count=1 ./... || fail "Tests fehlgeschlagen"
 
 log "Build-Check (amd64) ..."
-GOARCH=amd64 GOOS=linux go build -o /dev/null ./cmd/server/ || fail "Build fehlgeschlagen"
+GOARCH=amd64 GOOS=linux go build -o /dev/null ./cmd/deklarix/ || fail "Build fehlgeschlagen"
 
 log "Alle Tests bestanden ✓"