Unify Drupal and go-signs speaker list

[kylerisse]

Fixes #52

Description of PR

go-signs and drupal json endpoint now have identical data structure and the simulator was cleaned up as a result.

• constant marshalling and unmarshalling of Speakers from csv string to string slice. Now it's consistent everywhere and matches drupal
• simulator was storing 2 copies of the schedule to support each data structure, that is all now unified
• simulator was serving the archive from the filesystem and only contained previous years, now it serves it from bolt and includes all years
• simulator health check endpoint wasn't really for health, moved to / and now includes the current simulation end date
• simulator is backward compatible with any unstable version of go-signs post 0.1.0

Tests

• a lot of manual testing locally including manipulating bolt to trigger simulation resets while live

[sarcasticadmin]

@kylerisse thanks for unifying the speaker list between the two

simulator serves up json as expected for http://127.0.0.1:2018/sign.json:

$ nix build .#scale-simulator
$ ./result/bin/scale-simulator
2026/02/10 21:10:19 Successfully opened database: ./data/simulator.db
2026/02/10 21:10:19 JSON data for 13x already exists, skipping
2026/02/10 21:10:19 JSON data for 14x already exists, skipping
2026/02/10 21:10:19 JSON data for 15x already exists, skipping
2026/02/10 21:10:19 JSON data for 16x already exists, skipping
2026/02/10 21:10:19 JSON data for 17x already exists, skipping
2026/02/10 21:10:19 JSON data for 18x already exists, skipping
2026/02/10 21:10:19 JSON data for 19x already exists, skipping
2026/02/10 21:10:19 JSON data for 20x already exists, skipping
2026/02/10 21:10:19 JSON data for 21x already exists, skipping
2026/02/10 21:10:19 JSON data for 22x already exists, skipping
2026/02/10 21:10:19 JSON data for 23x already exists, skipping
2026/02/10 21:10:19 simulator started with database ./data/simulator.db on port 2018
2026/02/10 21:10:19 Running scheduled simulation check at 2026-02-10 21:10:19
2026/02/10 21:10:19 simulator listening on :2018
2026/02/10 21:10:19 Current date 2026-02-10 is past endDate 2026-01-26, will reset simulation
2026/02/10 21:10:19 Reset simulation bucket with new endDate: 2026-02-14
2026/02/10 21:10:19 Selected 17x as primary conference with date shifting
2026/02/10 21:10:19 Adding 211 nodes from 13x with original dates
2026/02/10 21:10:19 Adding 236 nodes from 14x with original dates
2026/02/10 21:10:19 Adding 220 nodes from 15x with original dates
2026/02/10 21:10:19 Adding 213 nodes from 16x with original dates
2026/02/10 21:10:19 Adding 229 nodes from 17x with original dates
2026/02/10 21:10:19 Adding 166 nodes from 18x with original dates
2026/02/10 21:10:19 Adding 117 nodes from 19x with original dates
2026/02/10 21:10:19 Adding 181 nodes from 20x with original dates
2026/02/10 21:10:19 Adding 242 nodes from 21x with original dates
2026/02/10 21:10:19 Adding 296 nodes from 22x with original dates
2026/02/10 21:10:19 Adding 10 nodes from 23x with original dates
2026/02/10 21:10:19 Merged a total of 2350 nodes from all JSON data sources
2026/02/10 21:10:19 Created mockJSON from 17x with date-shifted sessions plus original sessions from other conferences
2026/02/10 21:10:19 Simulation check completed successfully
2026/02/10 21:10:19 Scheduler started with interval of 5m0s
[GIN] 2026/02/10 - 21:10:43 | 200 |     101.361µs |       127.0.0.1 | GET      "/"
[GIN] 2026/02/10 - 21:10:43 | 404 |     215.164µs |       127.0.0.1 | GET      "/favicon.ico"
[GIN] 2026/02/10 - 21:11:49 | 200 |    3.222895ms |       127.0.0.1 | GET      "/sign.json"
[GIN] 2026/02/10 - 21:11:49 | 404 |      28.794µs |       127.0.0.1 | GET      "/favicon.ico"
^C2026/02/10 21:13:37 Shutdown signal received...
2026/02/10 21:13:37 Shutting down server...
2026/02/10 21:13:37 Scheduler stopping...
2026/02/10 21:13:37 Scheduler stopped successfully
2026/02/10 21:13:37 Server shutdown complete