Add EvoSync v3 environment scaffold

FastAPI + Celery + Redis + MariaDB stack with 6-service docker-compose.
Includes project skeleton (config, database, models, tasks, migrations)
and health endpoint with passing test.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

web/main.py

@@ -0,0 +1,19 @@
+import logging
+
+from fastapi import FastAPI
+
+try:
+    from pythonjsonlogger import jsonlogger
+    handler = logging.StreamHandler()
+    handler.setFormatter(jsonlogger.JsonFormatter("%(asctime)s %(levelname)s %(name)s %(message)s"))
+    logging.root.addHandler(handler)
+except ImportError:
+    logging.basicConfig(level=logging.INFO)
+logging.root.setLevel(logging.INFO)
+
+app = FastAPI(title="EvoSync")
+
+
+@app.get("/health")
+async def health():
+    return {"status": "ok"}