Add member identifiers table for ID documents (DL, passport, school ID)

member_identifier table with type, value, issuing authority, expiry,
front/back image storage (base64 in Postgres), primary flag. CRUD
endpoints under /members/:memberId/identifiers. Zod schemas with
constrained type enum.

packages/backend/src/db/migrations/0010_member_identifiers.sql

@@ -0,0 +1,18 @@
+-- Member identity documents (driver's license, passport, school ID, etc.)
+CREATE TABLE IF NOT EXISTS "member_identifier" (
+  "id" uuid PRIMARY KEY DEFAULT gen_random_uuid(),
+  "member_id" uuid NOT NULL REFERENCES "member"("id"),
+  "company_id" uuid NOT NULL REFERENCES "company"("id"),
+  "type" varchar(50) NOT NULL,
+  "label" varchar(100),
+  "value" varchar(255) NOT NULL,
+  "issuing_authority" varchar(255),
+  "issued_date" date,
+  "expires_at" date,
+  "image_front" text,
+  "image_back" text,
+  "notes" text,
+  "is_primary" boolean NOT NULL DEFAULT false,
+  "created_at" timestamp with time zone NOT NULL DEFAULT now(),
+  "updated_at" timestamp with time zone NOT NULL DEFAULT now()
+);

packages/backend/src/db/migrations/meta/_journal.json

@@ -71,6 +71,13 @@
       "when": 1774703400000,
       "tag": "0009_member_number",
       "breakpoints": true
+    },
+    {
+      "idx": 10,
+      "version": "7",
+      "when": 1774704000000,
+      "tag": "0010_member_identifiers",
+      "breakpoints": true
     }
   ]
 }