feat: Add initial PostgreSQL migration, refactor database connection to k_core, and simplify session store setup.

cargo-generate.toml

@@ -4,9 +4,21 @@ ignore = [".git", "target", ".idea", ".vscode"]
 
 [placeholders]
 project_name = { type = "string", prompt = "Project name" }
-database = { type = "string", prompt = "Database type", choices = ["sqlite", "postgres"], default = "sqlite" }
+database = { type = "string", prompt = "Database type", choices = [
+    "sqlite",
+    "postgres",
+], default = "sqlite" }
+
+[hooks]
+post = ["migrations.rhai"]
 
 [conditional]
 # Conditional dependencies based on database choice
-sqlite = { condition = "database == 'sqlite'", ignore = ["template-infra/src/user_repository_postgres.rs"] }
-postgres = { condition = "database == 'postgres'", ignore = ["template-infra/src/user_repository_sqlite.rs"] }
+sqlite = { condition = "database == 'sqlite'", ignore = [
+    "template-infra/src/user_repository_postgres.rs",
+    "migrations_postgres",
+] }
+postgres = { condition = "database == 'postgres'", ignore = [
+    "template-infra/src/user_repository_sqlite.rs",
+    "migrations",
+] }