feat: add Docker deployment and Gitea Actions CI/CD

Add multi-stage Dockerfile, docker-compose with persistent volumes,
and Gitea Actions workflows for CI (lint/test/build) and releases
(tag, Docker image push, changelog). Support DATABASE_PATH env var
for configurable SQLite location to enable proper volume mounting.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

drizzle.config.ts

@@ -1,10 +1,10 @@
 import { defineConfig } from "drizzle-kit";
 
 export default defineConfig({
-  out: "./drizzle",
-  schema: "./src/db/schema.ts",
-  dialect: "sqlite",
-  dbCredentials: {
-    url: "gearbox.db",
-  },
+	out: "./drizzle",
+	schema: "./src/db/schema.ts",
+	dialect: "sqlite",
+	dbCredentials: {
+		url: process.env.DATABASE_PATH || "gearbox.db",
+	},
 });