feat: add sidecar + processing migrations and postgres adapters

007_sidecar, 008_processing, 009_duplicate_groups migrations.
Tag, sidecar, job, batch, plugin, pipeline, duplicate repos.

crates/adapters/postgres/migrations/009_duplicate_groups.sql

@@ -0,0 +1,6 @@
+CREATE TABLE duplicate_groups (
+    group_id         UUID PRIMARY KEY,
+    detection_method TEXT NOT NULL DEFAULT 'exact_hash',
+    status           TEXT NOT NULL DEFAULT 'unresolved',
+    candidates       JSONB NOT NULL DEFAULT '[]'
+);