Replace S3 storage with Docker-mounted filesystem

- Add Docker and Compose deployment with persistent HTML and Postgres volumes
- Remove AWS storage configuration and dependency
- Document local Docker setup and filesystem storage

src/config.js

@@ -4,18 +4,13 @@ export const config = {
   bootstrapApiKey: process.env.POSTPLAN_BOOTSTRAP_API_KEY,
   publicBaseUrl: process.env.POSTPLAN_PUBLIC_BASE_URL,
   maxHtmlBytes: Number(process.env.MAX_HTML_BYTES || 512 * 1024),
+  // Directory for uploaded HTML. In Docker this is /data/html and should be a
+  // mounted volume so drafts survive container recreation.
+  htmlDir: process.env.POSTPLAN_HTML_DIR || "./data/html",
   // Web sign-in (dashboard). Absent POSTPLAN_SESSION_SECRET, all web-auth
   // routes respond 503 and the API/serving paths are unaffected.
   sessionSecret: process.env.POSTPLAN_SESSION_SECRET,
-  shooBaseUrl: (process.env.SHOO_BASE_URL || "https://shoo.dev").replace(/\/+$/, ""),
-  s3: {
-    endpoint: process.env.AWS_ENDPOINT_URL || process.env.S3_ENDPOINT,
-    accessKeyId: process.env.AWS_ACCESS_KEY_ID || process.env.S3_ACCESS_KEY_ID,
-    secretAccessKey: process.env.AWS_SECRET_ACCESS_KEY || process.env.S3_SECRET_ACCESS_KEY,
-    bucketName: process.env.AWS_S3_BUCKET_NAME || process.env.S3_BUCKET_NAME,
-    region: process.env.AWS_DEFAULT_REGION || process.env.AWS_REGION || "auto",
-    forcePathStyle: (process.env.AWS_S3_FORCE_PATH_STYLE || "true") !== "false"
-  }
+  shooBaseUrl: (process.env.SHOO_BASE_URL || "https://shoo.dev").replace(/\/+$/, "")
 };
 
 export function requireEnv(name, value) {