feat(api): complete unified v2 mobile surface

backend/command-api/sql/v2/003_v2_mobile_workflows.sql

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+CREATE TABLE IF NOT EXISTS emergency_contacts (
+  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+  tenant_id UUID NOT NULL REFERENCES tenants(id) ON DELETE CASCADE,
+  staff_id UUID NOT NULL REFERENCES staffs(id) ON DELETE CASCADE,
+  full_name TEXT NOT NULL,
+  phone TEXT NOT NULL,
+  relationship_type TEXT NOT NULL,
+  is_primary BOOLEAN NOT NULL DEFAULT FALSE,
+  metadata JSONB NOT NULL DEFAULT '{}'::jsonb,
+  created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+  updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+
+CREATE INDEX IF NOT EXISTS idx_emergency_contacts_staff
+  ON emergency_contacts (staff_id, created_at DESC);
+
+CREATE UNIQUE INDEX IF NOT EXISTS idx_emergency_contacts_primary_staff
+  ON emergency_contacts (staff_id)
+  WHERE is_primary = TRUE;
+
+ALTER TABLE assignments
+  DROP CONSTRAINT IF EXISTS assignments_status_check;
+
+ALTER TABLE assignments
+  ADD CONSTRAINT assignments_status_check
+  CHECK (status IN ('ASSIGNED', 'ACCEPTED', 'SWAP_REQUESTED', 'CHECKED_IN', 'CHECKED_OUT', 'COMPLETED', 'CANCELLED', 'NO_SHOW'));
+
+ALTER TABLE verification_jobs
+  ADD COLUMN IF NOT EXISTS owner_user_id TEXT REFERENCES users(id) ON DELETE SET NULL,
+  ADD COLUMN IF NOT EXISTS subject_type TEXT,
+  ADD COLUMN IF NOT EXISTS subject_id TEXT;
+
+ALTER TABLE staff_documents
+  ADD COLUMN IF NOT EXISTS verification_job_id UUID REFERENCES verification_jobs(id) ON DELETE SET NULL;
+
+ALTER TABLE certificates
+  ADD COLUMN IF NOT EXISTS file_uri TEXT,
+  ADD COLUMN IF NOT EXISTS verification_job_id UUID REFERENCES verification_jobs(id) ON DELETE SET NULL;
+
+CREATE INDEX IF NOT EXISTS idx_verification_jobs_owner
+  ON verification_jobs (owner_user_id, created_at DESC);
+
+CREATE INDEX IF NOT EXISTS idx_verification_jobs_subject
+  ON verification_jobs (subject_type, subject_id, created_at DESC);