fix(infra): replace PostgreSQL init.sql with init.sh for correct schema initialization

- Removed invalid init.sql with syntax error (ALTER DEFAULT PRIVILEGES IN DATABASE unsupported)
- Added init.sh with corrected SQL using IN SCHEMA public
- Fixes PostgreSQL initialization for RLS and permissions setup

Ultraworked with Sisyphus <https://github.com/code-yeongyu/oh-my-opencode>
Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

infra/postgres/init.sh

@@ -0,0 +1,28 @@
+#!/bin/bash
+# PostgreSQL initialization script for development environment
+# Creates: workclub (application data), keycloak (Keycloak metadata)
+
+set -e
+
+# Create application database
+psql -v ON_ERROR_STOP=1 --username "$POSTGRES_USER" --dbname "$POSTGRES_DB" <<-EOSQL
+    CREATE USER app WITH PASSWORD 'devpass';
+    CREATE DATABASE workclub OWNER app;
+    ALTER DEFAULT PRIVILEGES IN SCHEMA public GRANT ALL ON TABLES TO app;
+    ALTER DEFAULT PRIVILEGES IN SCHEMA public GRANT ALL ON SEQUENCES TO app;
+EOSQL
+
+# Create Keycloak database
+psql -v ON_ERROR_STOP=1 --username "$POSTGRES_USER" --dbname "$POSTGRES_DB" <<-EOSQL
+    CREATE USER keycloak WITH PASSWORD 'keycloakpass';
+    CREATE DATABASE keycloak OWNER keycloak;
+EOSQL
+
+# Grant privileges in keycloak database
+psql -v ON_ERROR_STOP=1 --username "$POSTGRES_USER" --dbname "keycloak" <<-EOSQL
+    GRANT ALL ON SCHEMA public TO keycloak;
+    ALTER DEFAULT PRIVILEGES IN SCHEMA public GRANT ALL ON TABLES TO keycloak;
+    ALTER DEFAULT PRIVILEGES IN SCHEMA public GRANT ALL ON SEQUENCES TO keycloak;
+EOSQL
+
+echo "PostgreSQL initialization complete: workclub and keycloak databases created"