feat: add lyricResolve for resole .lrc file

feat: add backgroundDisplay for play ascii video in terminal
	feat: add musicPlayer for play music in terminal

modules/backgroundDisplay.h

@@ -0,0 +1,76 @@
+// backgroundDisplay.h
+//
+// Decode a video file (MP4 or any FFmpeg-supported container/codec) and play
+// it in the terminal as truecolor ASCII art, honouring the video's aspect
+// ratio.
+//
+// Terminal behaviour:
+//   - If the terminal can be resized programmatically ("adjustable"), the
+//     current width is kept and the height is set so the ASCII grid matches
+//     the video aspect ratio (terminal cells are roughly 2:1 tall:wide).
+//   - Otherwise the video is letterboxed to the largest size that fits the
+//     current terminal and the video frame size (e.g. "1280x720") is printed
+//     in the top-left corner of the terminal.
+//
+// This module is self-contained (raw ANSI escape sequences, no ncurses).
+// Decoding runs on a background thread; playVideo() blocks the calling
+// thread for the duration of playback, so callers can run several show
+// components concurrently by using their own std::thread.
+
+#pragma once
+
+#include <string>
+#include <atomic>
+
+namespace bd {
+
+struct TermSize {
+    int cols = 0;  // character columns
+    int rows = 0;  // character rows
+    bool ok = false;  // false when stdout is not a tty or the size is unknown
+};
+
+struct GridSize {
+    int cols = 0;
+    int rows = 0;
+};
+
+// --- terminal helpers -----------------------------------------------------
+
+// True if stdout is an interactive terminal (isatty).
+bool isTerminal();
+
+// Current terminal size in character cells.
+TermSize terminalSize();
+
+// Ask the terminal to resize to (rows x cols) via the xterm sequence
+// "\x1b[8;rows;colst" and verify it actually took effect (TIOCGWINSZ).
+bool resizeTerminal(int rows, int cols);
+
+// Probe whether the terminal honours programmatic resize requests. Restores
+// the original size afterwards.
+bool isTerminalAdjustable();
+
+// Largest whole grid (cols x rows) with the video aspect ratio that fits
+// inside (maxCols x maxRows). Rows are counted with 2:1 cell aspect.
+GridSize fitSizeForAspect(int videoW, int videoH, int maxCols, int maxRows);
+
+// --- video playback -------------------------------------------------------
+
+struct PlayVideoOptions {
+    std::string path;
+    bool loop = false;              // repeat the video until stop
+    float intensity = 1.0f;         // brightness multiplier for fg/bg
+    bool tryResize = true;          // false => force the "not adjustable" fit path
+    int bottomRows = 0;             // leave this many rows at the bottom for other content
+    std::atomic<bool>* stop = nullptr;  // set to true to end playback early
+};
+
+// Play `path` as ASCII art. Blocks until the video ends (or `stop` is set).
+// Returns:
+//   0  playback finished (or stopped) cleanly
+//   1  failed to open/decode the video
+//   2  stdout is not a tty (nothing was written)
+int playVideo(const std::string& path, const PlayVideoOptions& opts = {});
+
+}  // namespace bd