feat(import): add ImportJob model for Apple Health export ingest

Additive Prisma model mirroring a `pg-boss` `apple-health-import`
job's lifecycle. The polling endpoint reads `progress` and `result`
live from this row rather than the one-shot terminal `output` column
on `pg_boss.job` (pg-boss v12 only populates `output` on completion).

Carries `pgBossJobId` for the worker's reverse lookup, an upload
sha-256 for content-hash idempotency on re-upload, and per-phase
status (`queued | unpacking | parsing | upserting | done | failed`).

prisma/migrations/0066_v1434_import_jobs/migration.sql

@@ -0,0 +1,45 @@
+-- v1.4.34 — Apple Health export.zip import jobs
+--
+-- Additive-only — one new table mirroring the lifecycle of a pg-boss
+-- `apple-health-import` job. The polling endpoint reads from this
+-- table so the operator sees live per-phase progress rather than the
+-- one-shot terminal `output` column on `pg_boss.job` (v12 contract).
+--
+-- `pg_boss_job_id` is nullable so the `INSERT` can land before the
+-- kick-off route gets the boss id back from `boss.send`. The unique
+-- index covers the populated rows; NULL values are distinct under
+-- the default Postgres semantics so two pre-send rows never collide.
+--
+-- Locks per `.planning/research/v1434-r-1-xml-import.md` §5.2.
+
+CREATE TABLE IF NOT EXISTS "import_jobs" (
+    "id"                    TEXT NOT NULL,
+    "user_id"               TEXT NOT NULL,
+    "triggered_by_admin_id" TEXT,
+    "pg_boss_job_id"        TEXT,
+    "status"                TEXT NOT NULL DEFAULT 'queued',
+    "failure_reason"        TEXT,
+    "upload_bytes"          INTEGER NOT NULL,
+    "upload_sha256"         TEXT,
+    "exported_at"           TIMESTAMP(3),
+    "started_at"            TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "completed_at"          TIMESTAMP(3),
+    "progress"              JSONB NOT NULL DEFAULT '{}'::jsonb,
+    "result"                JSONB,
+
+    CONSTRAINT "import_jobs_pkey" PRIMARY KEY ("id")
+);
+
+CREATE UNIQUE INDEX IF NOT EXISTS "import_jobs_pg_boss_job_id_key"
+    ON "import_jobs" ("pg_boss_job_id");
+
+CREATE INDEX IF NOT EXISTS "import_jobs_user_id_started_at_idx"
+    ON "import_jobs" ("user_id", "started_at");
+
+CREATE INDEX IF NOT EXISTS "import_jobs_status_idx"
+    ON "import_jobs" ("status");
+
+ALTER TABLE "import_jobs"
+    ADD CONSTRAINT "import_jobs_user_id_fkey"
+    FOREIGN KEY ("user_id") REFERENCES "users"("id")
+    ON DELETE CASCADE ON UPDATE CASCADE;