Fix sync: add missing tables, Linux date, token from env

Add production and consumption table migrations. Fix sync-month.sh
to use Linux date syntax and default to port 3030. Read Eloverblik
token from ELOVERBLIK_TOKEN env var with .token file fallback.
Mount .token into Docker container.

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

resources/migrations/20260214170000-create-production.up.sql

@@ -0,0 +1,6 @@
+CREATE TABLE production (
+  time_start TIMESTAMPTZ NOT NULL,
+  hour       INTEGER     NOT NULL,
+  kwh        DOUBLE PRECISION,
+  PRIMARY KEY (time_start, hour)
+);