Separate Python and Rust into python/ and rust/ with per-stack Dockerfiles

rust/myfsio-engine/crates/myfsio-common/src/constants.rs

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+pub const SYSTEM_ROOT: &str = ".myfsio.sys";
+pub const SYSTEM_BUCKETS_DIR: &str = "buckets";
+pub const SYSTEM_MULTIPART_DIR: &str = "multipart";
+pub const BUCKET_META_DIR: &str = "meta";
+pub const BUCKET_VERSIONS_DIR: &str = "versions";
+pub const BUCKET_CONFIG_FILE: &str = ".bucket.json";
+pub const STATS_FILE: &str = "stats.json";
+pub const ETAG_INDEX_FILE: &str = "etag_index.json";
+pub const INDEX_FILE: &str = "_index.json";
+pub const MANIFEST_FILE: &str = "manifest.json";
+
+pub const INTERNAL_FOLDERS: &[&str] = &[".meta", ".versions", ".multipart"];
+
+pub const DEFAULT_REGION: &str = "us-east-1";
+pub const AWS_SERVICE: &str = "s3";
+
+pub const DEFAULT_MAX_KEYS: usize = 1000;
+pub const DEFAULT_OBJECT_KEY_MAX_BYTES: usize = 1024;
+pub const DEFAULT_CHUNK_SIZE: usize = 65536;
+pub const STREAM_CHUNK_SIZE: usize = 1_048_576;