Initial commit: SRDB - High-performance LSM-Tree database

- Core engine with MemTable, SST, WAL
- B+Tree indexing for SST files  
- Leveled compaction strategy
- Multi-table database management
- Schema validation and secondary indexes
- Query builder with complex conditions
- Web UI with HTMX for data visualization
- Command-line tools for diagnostics

manifest/manifest_reader.go

@@ -0,0 +1,48 @@
+package manifest
+
+import (
+	"encoding/binary"
+	"io"
+)
+
+// Reader MANIFEST 读取器
+type Reader struct {
+	file io.Reader
+}
+
+// NewReader 创建 MANIFEST 读取器
+func NewReader(file io.Reader) *Reader {
+	return &Reader{
+		file: file,
+	}
+}
+
+// ReadEdit 读取版本变更
+func (r *Reader) ReadEdit() (*VersionEdit, error) {
+	// 读取 CRC32 和 Length
+	header := make([]byte, 8)
+	_, err := io.ReadFull(r.file, header)
+	if err != nil {
+		return nil, err
+	}
+
+	// 读取长度
+	length := binary.LittleEndian.Uint32(header[4:8])
+
+	// 读取数据
+	data := make([]byte, 8+length)
+	copy(data[0:8], header)
+	_, err = io.ReadFull(r.file, data[8:])
+	if err != nil {
+		return nil, err
+	}
+
+	// 解码
+	edit := NewVersionEdit()
+	err = edit.Decode(data)
+	if err != nil {
+		return nil, err
+	}
+
+	return edit, nil
+}