feat: complete dashcam catalog ingestion demo

ingestion/migrations/002_source_specs_and_conflicts.sql

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+alter table products add column if not exists canonical_name text;
+update products set canonical_name = trim(brand || ' ' || model) where canonical_name is null;
+alter table products alter column canonical_name set not null;
+
+create table if not exists product_source_specs (
+  id uuid primary key default gen_random_uuid(),
+  product_id text not null references products(id) on delete cascade,
+  source text not null check (source in ('yandex_market')),
+  source_url text not null,
+  source_product_id text,
+  raw_group text,
+  raw_label text not null,
+  raw_value jsonb not null,
+  normalized_key text,
+  normalized_value jsonb,
+  value_hash text not null,
+  fetched_at timestamptz not null,
+  created_at timestamptz not null default now(),
+  updated_at timestamptz not null default now(),
+  unique (product_id, source, source_url, raw_label)
+);
+
+create index if not exists product_source_specs_product_key_idx on product_source_specs(product_id, normalized_key);
+
+create table if not exists moderation_conflicts (
+  id uuid primary key default gen_random_uuid(),
+  product_id text not null references products(id) on delete cascade,
+  conflict_type text not null check (conflict_type in ('spec_value')),
+  key text not null,
+  values_json jsonb not null,
+  state text not null default 'pending' check (state in ('pending', 'resolved', 'dismissed')),
+  created_at timestamptz not null default now(),
+  updated_at timestamptz not null default now(),
+  unique (product_id, conflict_type, key)
+);