chore: Clean up duplicate files and update gitignore

- Remove duplicate enhanced_s3_server.go and iam_config.json from root
- Remove unnecessary Dockerfile.test and backup files
- Update gitignore for better file management
- Consolidate IAM integration files in proper locations

test/s3/iam/Dockerfile.test

@@ -1,70 +0,0 @@
-# Dockerfile for SeaweedFS S3 IAM Integration Tests
-
-FROM golang:1.24-alpine AS builder
-
-# Install build dependencies
-RUN apk add --no-cache git make curl bash
-
-# Set working directory
-WORKDIR /app
-
-# Copy go modules first for better caching
-COPY go.mod go.sum ./
-RUN go mod download
-
-# Copy source code
-COPY ../../../ .
-
-# Build SeaweedFS binary
-RUN go build -o weed ./main.go
-
-# Create runtime image
-FROM alpine:latest
-
-# Install runtime dependencies
-RUN apk add --no-cache \
-    bash \
-    curl \
-    ca-certificates \
-    && rm -rf /var/cache/apk/*
-
-# Create test user
-RUN addgroup -g 1000 seaweedfs && \
-    adduser -D -u 1000 -G seaweedfs seaweedfs
-
-# Set working directory
-WORKDIR /app
-
-# Copy built binary
-COPY --from=builder /app/weed /usr/local/bin/weed
-
-# Copy test files
-COPY . /app/test/s3/iam/
-
-# Set permissions
-RUN chown -R seaweedfs:seaweedfs /app
-
-# Switch to test user
-USER seaweedfs
-
-# Set environment variables
-ENV WEED_BINARY=/usr/local/bin/weed
-ENV S3_PORT=8333
-ENV FILER_PORT=8888
-ENV MASTER_PORT=9333
-ENV VOLUME_PORT=8080
-ENV LOG_LEVEL=2
-ENV TEST_TIMEOUT=30m
-
-# Expose ports
-EXPOSE 8333 8888 9333 8080
-
-# Work in test directory
-WORKDIR /app/test/s3/iam
-
-# Health check
-HEALTHCHECK --interval=10s --timeout=5s --start-period=30s --retries=3 \
-    CMD curl -f http://localhost:8333/ || exit 1
-
-# Default command runs the tests
-CMD ["make", "test"]