Implement Pravda: Truth Social to Discord relay service

- Add core modules: database (SQLite), media (ffmpeg), discord (webhook), poller (truthbrush), server (FastAPI)
- Support video transcoding to H.264/AAC with automatic size management
- Handle message splitting for Discord limits (2000 chars, 10 attachments)
- Include interactive buttons (Delete, View Raw, Original Post)
- Add Dockerfile with ffmpeg and entrypoint script
- Add Gitea Actions workflow for CI/CD
- Configure code style tools (black, ruff, mypy)
- Include basic unit tests

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

tests/test_database.py

@@ -0,0 +1,41 @@
+"""Tests for the database module."""
+
+import os
+import tempfile
+
+import pytest
+
+
+def test_database_operations() -> None:
+    """Test basic database operations."""
+    # Use a temporary database for testing
+    with tempfile.TemporaryDirectory() as tmpdir:
+        db_path = os.path.join(tmpdir, "test.db")
+        os.environ["DB_PATH"] = db_path
+
+        # Import after setting env var
+        from src.database import init_db, is_post_seen, mark_post_seen, get_seen_count
+
+        init_db()
+
+        # Initially, no posts are seen
+        assert not is_post_seen("123")
+        assert get_seen_count() == 0
+
+        # Mark a post as seen
+        mark_post_seen("123")
+        assert is_post_seen("123")
+        assert get_seen_count() == 1
+
+        # Mark the same post again (should be idempotent)
+        mark_post_seen("123")
+        assert is_post_seen("123")
+        assert get_seen_count() == 1
+
+        # Mark another post
+        mark_post_seen("456")
+        assert is_post_seen("456")
+        assert get_seen_count() == 2
+
+        # Original post still seen
+        assert is_post_seen("123")