chore: initialize project scaffold and config

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-opencode)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

docker-compose.yml

@@ -0,0 +1,20 @@
+services:
+  postgres:
+    image: pgvector/pgvector:pg16
+    environment:
+      POSTGRES_DB: mnemosyne
+      POSTGRES_USER: mnemosyne
+      POSTGRES_PASSWORD: mnemosyne_dev
+    ports:
+      - "5433:5432"
+    volumes:
+      - pgdata:/var/lib/postgresql/data
+      - ./sql/init.sql:/docker-entrypoint-initdb.d/01-init.sql
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U mnemosyne"]
+      interval: 5s
+      timeout: 5s
+      retries: 5
+
+volumes:
+  pgdata: