Phase 7: Directory restructuring (messaging/ and tests/)

- Create messaging/platforms/ (base, discord, telegram, factory)
- Create messaging/rendering/ (discord_markdown, telegram_markdown)
- Create messaging/trees/ (data, repository, processor, queue_manager)
- Organize tests/ into api/, providers/, messaging/, cli/, config/
- Add backward-compatible re-exports at old locations
- Update handler.py and test_messaging_factory.py imports
- Fix Telegram type hints for TELEGRAM_AVAILABLE=False case
- Fix Python 3 except syntax in discord_markdown

Co-authored-by: Ali Khokhar <alishahryar2@gmail.com>

tests/api/test_server_module.py

@@ -0,0 +1,32 @@
+def test_server_module_exports_app_and_create_app():
+    import server
+
+    assert server.app is not None
+    assert callable(server.create_app)
+
+
+def test_server_main_invokes_uvicorn_run(monkeypatch):
+    import runpy
+    from types import SimpleNamespace
+    from unittest.mock import patch
+
+    import config.settings as settings_mod
+    import uvicorn as uvicorn_mod
+
+    # Patch settings used by server.__main__ block.
+    old_get_settings = settings_mod.get_settings
+    mock_settings = SimpleNamespace(host="127.0.0.1", port=9999)
+
+    try:
+        with (
+            patch.object(settings_mod, "get_settings", lambda: mock_settings),
+            patch.object(uvicorn_mod, "run") as mock_run,
+        ):
+            runpy.run_module("server", run_name="__main__")
+            mock_run.assert_called_once()
+            call_kwargs = mock_run.call_args[1]
+            assert call_kwargs["host"] == "127.0.0.1"
+            assert call_kwargs["port"] == 9999
+            assert call_kwargs["log_level"] == "debug"
+    finally:
+        settings_mod.get_settings = old_get_settings