Add S3 API Comparison page and update sidebar

S3-API-Comparison.md

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+# S3 API Comparison: SeaweedFS vs MinIO
+
+This page compares the S3 API implementation in SeaweedFS with MinIO.
+
+## Comparison Summary
+
+| Feature Area | SeaweedFS Support | MinIO Support | Notes |
+| :--- | :---: | :---: | :--- |
+| **Basic Object Ops** | ✅ Full | ✅ Full | GET, PUT, DELETE, HEAD, COPY |
+| **Bucket Ops** | ✅ Full | ✅ Full | Create, Delete, List, Head |
+| **Multipart Upload**| ✅ Full | ✅ Full | |
+| **Object Tagging** | ✅ Full | ✅ Full | |
+| **Object Lock** | ✅ Full | ✅ Full | Retention, Legal Hold |
+| **Bucket Policy** | ✅ Full | ✅ Full | |
+| **Lifecycle** | ✅ Full | ✅ Full | |
+| **Versioning** | ✅ Full | ✅ Full | |
+| **ACLs** | ✅ Full | ⚠️ Partial | MinIO has dummy handlers for some ACLs |
+| **S3 Tables** | ✅ Full | ❌ No | SeaweedFS supports Iceberg via S3 Tables |
+| **Object Select** | ❌ No | ✅ Yes | `SelectObjectContent` |
+| **Object Attributes**| ❌ No | ✅ Yes | `GetObjectAttributes` |
+| **Lambda Triggers** | ❌ No | ✅ Yes | `GetObjectLambda` |
+| **Sts** | ✅ Partial | ✅ Full | Both support AssumeRole |
+
+## Implemented APIs (Both)
+
+- **Service Operations**: `ListBuckets`
+- **Bucket Operations**: `HeadBucket`, `PutBucket`, `DeleteBucket`, `ListObjectsV1`, `ListObjectsV2`, `ListObjectVersions`, `GetBucketAcl`, `PutBucketAcl`, `GetBucketPolicy`, `PutBucketPolicy`, `DeleteBucketPolicy`, `GetBucketCors`, `PutBucketCors`, `DeleteBucketCors`, `GetBucketLifecycle`, `PutBucketLifecycle`, `DeleteBucketLifecycle`, `GetBucketLocation`, `GetBucketVersioning`, `PutBucketVersioning`, `GetBucketObjectLockConfiguration`, `PutBucketObjectLockConfiguration`, `GetBucketTagging`, `PutBucketTagging`, `DeleteBucketTagging`, `GetBucketEncryption`, `PutBucketEncryption`, `DeleteBucketEncryption`
+- **Object Operations**: `HeadObject`, `GetObject`, `PutObject`, `DeleteObject`, `CopyObject`, `DeleteMultipleObjects`, `GetObjectTagging`, `PutObjectTagging`, `DeleteObjectTagging`, `GetObjectAcl`, `PutObjectAcl`, `GetObjectRetention`, `PutObjectRetention`, `GetObjectLegalHold`, `PutObjectLegalHold`
+- **Multipart Upload**: `CreateMultipartUpload`, `AbortMultipartUpload`, `CompleteMultipartUpload`, `UploadPart`, `CopyObjectPart`, `ListMultipartUploads`, `ListParts`
+
+## SeaweedFS Specific / Better Implemented
+
+- **S3 Tables API (Iceberg Support)**: Extensive support for Iceberg tables, namespaces, and buckets.
+    - `CreateTableBucket`, `ListTableBuckets`, `GetTableBucket`, `DeleteTableBucket`, `CreateNamespace`, `CreateTable`, etc.
+- **Bucket Management**: SeaweedFS implements `PublicAccessBlock` and `OwnershipControls` which are rejected or labeled as dummy in some MinIO versions.
+
+## MinIO Specific / Not in SeaweedFS
+
+- **Advanced Object Querying**: `SelectObjectContent`, `GetObjectAttributes`.
+- **Extensions**: `GetObjectLambda`, `PostRestoreObject`, `Snowball Extract`.
+- **Replication**: MinIO has more native S3 replication APIs.
+
+## Detailed Comparison Table
+
+| API Action | SeaweedFS | MinIO |
+| :--- | :---: | :---: |
+| `s3:GetObject` | ✅ | ✅ |
+| `s3:PutObject` | ✅ | ✅ |
+| `s3:DeleteObject` | ✅ | ✅ |
+| `s3:CopyObject` | ✅ | ✅ |
+| `s3:SelectObjectContent` | ❌ | ✅ |
+| `s3:GetObjectAttributes` | ❌ | ✅ |
+| `s3:PostRestoreObject` | ❌ | ✅ |
+| `s3:GetBucketCORS` | ✅ | ✅ |
+| `s3:PutBucketCORS` | ✅ | ⚠️ (Dummy) |
+| `s3:GetBucketACL` | ✅ | ✅ |
+| `s3:PutBucketACL` | ✅ | ⚠️ (Dummy) |
+| `s3:GetBucketLifecycle` | ✅ | ✅ |
+| `s3:PutBucketLifecycle` | ✅ | ✅ |
+| `s3:GetBucketEncryption` | ✅ | ✅ |
+| `s3:GetBucketVersioning` | ✅ | ✅ |
+| `s3:GetBucketLocation` | ✅ | ✅ |
+| `s3:GetBucketPolicy` | ✅ | ✅ |
+| `s3:PutBucketPolicy` | ✅ | ✅ |
+| `s3:DeleteBucketPolicy` | ✅ | ✅ |
+| `s3:GetBucketObjectLockConfiguration` | ✅ | ✅ |
+| `s3:GetBucketTagging` | ✅ | ✅ |
+| `s3:PutBucketOwnershipControls` | ✅ | ❌ (Rejected) |
+| `s3:GetPublicAccessBlock` | ✅ | ❌ (Rejected) |

_Sidebar.md

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 ### AWS S3 API
 * [[Amazon S3 API]]
+* [[S3 API Comparison]]
 * [[S3 Conditional Operations]]
 * [[S3 CORS]]
 * [[S3 Object Lock and Retention]]