Add job board scraper: modular scrapers, SQLite storage, web UI

Scrapes slo-tech.com (Ljubljana) every 24h, stores jobs in SQLite and
tracks which are new vs. seen. New sites can be added as modules in
src/scrapers/.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

scrapper/README.md

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+# Job Board
+
+Scrapes job sites once a day, stores results in SQLite (`data/jobs.sqlite`), and shows them in a web UI where you can mark jobs as seen.
+
+No runtime dependencies. It uses Bun's built-in SQLite, HTTP server and HTMLRewriter.
+
+## Run
+
+```sh
+bun install
+bun start            # http://localhost:3000
+```
+
+The server scrapes every 24h. On startup it waits out the rest of the 24h since the last scrape (or scrapes right away if none happened in the last 24h).
+You can also click **Scrape now** in the UI, or run `bun run scrape` once (e.g. from cron).
+
+Env vars: `PORT` (3000), `SCRAPE_INTERVAL_HOURS` (24), `DB_PATH` (`data/jobs.sqlite`).
+
+## UI
+
+- **New / Seen / All** tabs. Opening a job, or clicking *Mark seen*, moves it to Seen.
+- **no longer listed** means the job was missing from that source's latest successful scrape.
+- Search filters on title, company and tags. Recent scrape runs (and errors) are listed at the bottom.
+
+## Adding a site
+
+1. Create `src/scrapers/<site>.ts` exporting an object that implements `Scraper` (`src/scrapers/types.ts`):
+   ```ts
+   export const mySite: Scraper = {
+     id: "my-site",          // stable, stored in DB
+     name: "My Site",
+     async scrape() {
+       const html = await fetchHtml("https://...");   // helper in ./http.ts
+       return [/* { externalId, title, url, company?, location?, tags?, postedAt? } */];
+     },
+   };
+   ```
+2. Add it to the list in `src/scrapers/index.ts`.
+
+`externalId` must stay stable for a job, because it is what decides whether a job is new.
+For another slo-tech city, just add `sloTech("Maribor")` to the list.