feat: add scripts for database inspection and migration

- Implemented multiple scripts to check and inspect meal plans, scraped data, and accommodations for Munich and Riga.
- Added a migration script to convert scraped data into the application's database format.
- Introduced new database service methods for querying and updating travel rates.
- Enhanced server configuration for serving static files in production.
- Updated PostCSS configuration for consistency.

scripts/peekMunichKeys.js

@@ -0,0 +1,13 @@
+const Database = require("better-sqlite3");
+const path = require("path");
+const db = new Database(
+  path.join(__dirname, "..", "data", "travel_rates_scraped.sqlite3")
+);
+const row = db
+  .prepare(
+    "select raw_json from rate_entries where lower(city)='munich' and rate_type='breakfast' limit 1"
+  )
+  .get();
+const data = JSON.parse(row.raw_json);
+console.log(Object.keys(data));
+console.log(data);