feat(worker): add weekly job scrape worker with portal integrations, scoring, and Twenty CRM sync

apps/worker/schema.sql

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+-- D1 schema for the jobsdb snapshot (documents/postings/jobs.db). Applied first by
+-- scripts/import-postings.ts as .import/0000-schema.sql; idempotent.
+--
+-- `postings` mirrors the source table column-for-column (all TEXT). `companies`
+-- carries only what src/portals/jobsdb.ts reads. `postings_fts` is a
+-- self-contained FTS5 table (not external-content: those need the shadow
+-- tables, which `wrangler d1 execute --file` cannot bulk-load sanely), joined
+-- on posting_id rather than rowid.
+
+CREATE TABLE IF NOT EXISTS postings (
+  posting_id TEXT PRIMARY KEY,
+  company_id TEXT,
+  company_name TEXT,
+  company_domain TEXT,
+  title TEXT,
+  department TEXT,
+  function TEXT,
+  seniority TEXT,
+  posted_date TEXT,
+  location_text TEXT,
+  remote_policy_stated TEXT,
+  location_class TEXT,
+  location_country TEXT,
+  salary_min TEXT,
+  salary_max TEXT,
+  salary_currency TEXT,
+  url TEXT,
+  source_ats TEXT,
+  source_tier TEXT,
+  scrape_timestamp TEXT,
+  classification_rationale TEXT
+);
+
+CREATE TABLE IF NOT EXISTS companies (
+  company_id TEXT PRIMARY KEY,
+  name TEXT,
+  target_sector TEXT,
+  crypto_native TEXT,
+  priority_tier INTEGER,
+  homepage_domain TEXT
+);
+
+CREATE INDEX IF NOT EXISTS postings_company_id ON postings(company_id);
+CREATE INDEX IF NOT EXISTS postings_location_class ON postings(location_class);
+CREATE INDEX IF NOT EXISTS postings_seniority ON postings(seniority);
+
+CREATE VIRTUAL TABLE IF NOT EXISTS postings_fts USING fts5(posting_id UNINDEXED, title, company_name, location_text);