MIL-001: project foundation

pyproject.toml (Python >=3.13, no runtime dependencies, speech and dev extras),
Python .gitignore, layer skeleton with constants.py, Doxyfile, README with the
.venv instructions, the Malay to Danish word list and review record RC-023.

Task: MIL-001#1
Task: MIL-001#2
Task: MIL-001#3
Task: MIL-001#4
Task: MIL-001#5
Task: MIL-001#6

src/flash_card/__main__.py

@@ -0,0 +1,10 @@
+"""Run the flash card program with ``python -m flash_card``.
+
+@file __main__.py
+@brief Module entry point that calls the presentation layer.
+"""
+
+from flash_card.presentation.app import run
+
+if __name__ == "__main__":
+    run()