chore(restructure): reorganize project layout

- Reorganize internal packages and overall project structure
- Update imports and wiring to match the new layout
- Separate HTTP parsing and streaming from the server package
- Separate middleware from the server package
- Separate session registry from the session package
- Move HTTP, HTTPS, and TCP servers to the transport package
- Session package no longer starts the TCP server directly
- Server package no longer starts HTTP/HTTPS servers on initialization
- Forwarder no longer handles accepting TCP requests
- Move session details to the types package
- HTTP/HTTPS initialization is now the responsibility of main

internal/http/stream/parser.go

@@ -0,0 +1,29 @@
+package stream
+
+import "bytes"
+
+func splitHeaderAndBody(data []byte, delimiterIdx int) ([]byte, []byte) {
+	headerByte := data[:delimiterIdx+len(DELIMITER)]
+	body := data[delimiterIdx+len(DELIMITER):]
+	return headerByte, body
+}
+
+func isHTTPHeader(buf []byte) bool {
+	lines := bytes.Split(buf, []byte("\r\n"))
+
+	startLine := string(lines[0])
+	if !requestLine.MatchString(startLine) && !responseLine.MatchString(startLine) {
+		return false
+	}
+
+	for _, line := range lines[1:] {
+		if len(line) == 0 {
+			break
+		}
+		colonIdx := bytes.IndexByte(line, ':')
+		if colonIdx <= 0 {
+			return false
+		}
+	}
+	return true
+}