fix and refactor vfs modules to merge ourdb implementations into generic vfs_db and separate vfs_local

lib/vfs/metadata.v

@@ -0,0 +1,57 @@
+module vfs
+
+import time
+
+// Metadata represents the common metadata for both files and directories
+pub struct Metadata {
+pub mut:
+	id          u32    @[required] // unique identifier used as key in DB
+	name        string @[required] // name of file or directory
+	file_type   FileType
+	size        u64
+	created_at  i64 // unix epoch timestamp
+	modified_at i64 // unix epoch timestamp
+	accessed_at i64 // unix epoch timestamp
+	mode        u32 // file permissions
+	owner       string
+	group       string
+}
+
+// FileType represents the type of a filesystem entry
+pub enum FileType {
+	file
+	directory
+	symlink
+}
+
+// mkdir creates a new directory with default permissions
+pub fn new_metadata(metadata Metadata) Metadata {
+	current_time := time.now().unix()
+	return Metadata{
+		...metadata
+		created_at:  current_time
+		modified_at: current_time
+		accessed_at: current_time
+	}
+}
+
+// Get time.Time objects from epochs
+pub fn (m Metadata) created_time() time.Time {
+	return time.unix(m.created_at)
+}
+
+pub fn (m Metadata) modified_time() time.Time {
+	return time.unix(m.modified_at)
+}
+
+pub fn (m Metadata) accessed_time() time.Time {
+	return time.unix(m.accessed_at)
+}
+
+pub fn (mut m Metadata) modified() {
+	m.modified_at = time.now().unix()
+}
+
+pub fn (mut m Metadata) accessed() {
+	m.accessed_at = time.now().unix()
+}