feat(BE-115,116,117): implement chickin CRUD, approve logic, and stock availabilit

internal/database/migrations/20251019141014_create_audit_logs_table.up.sql

@@ -0,0 +1,13 @@
+CREATE TABLE audit_logs (
+    id BIGSERIAL PRIMARY KEY,
+    table_name VARCHAR(100) NOT NULL,
+    record_id BIGINT NOT NULL,
+    action VARCHAR(30) NOT NULL,
+    before_data JSONB,
+    after_data JSONB,
+    changed_by BIGINT,
+    created_at TIMESTAMPTZ DEFAULT now()
+);
+
+ALTER TABLE audit_logs
+ADD CONSTRAINT fk_changed_by FOREIGN KEY (changed_by) REFERENCES users (id);