feat: default code interpreter and logic function to Disabled in production (#18559)

## Summary

For security reasons, the code interpreter and logic function drivers
now default based on `NODE_ENV`:

- **Production** (`NODE_ENV=production` or unset): Default to
**Disabled**
- **Development** (`NODE_ENV=development`): Default to **LOCAL** for
convenience

This ensures self-hosted production deployments don't accidentally run
user-provided code without explicit configuration.

## Changes

### Config (`config-variables.ts`)
- `CODE_INTERPRETER_TYPE`: Disabled in prod, LOCAL in dev
- `LOGIC_FUNCTION_TYPE`: Disabled in prod, LOCAL in dev

### Documentation (`setup.mdx`)
- Added **Security Defaults** section explaining NODE_ENV-based behavior
- Fixed variable names: `SERVERLESS_TYPE` → `LOGIC_FUNCTION_TYPE`,
`SERVERLESS_LAMBDA_*` → `LOGIC_FUNCTION_LAMBDA_*`
- Added **Code Interpreter** section with available drivers (Disabled,
Local, E2B)

### Environment files
- `.env.example`: Updated to `LOGIC_FUNCTION_TYPE` with comments
- `.env.test`: Added `LOGIC_FUNCTION_TYPE=LOCAL` for logic function
integration tests

Made with [Cursor](https://cursor.com)

---------

Co-authored-by: claude[bot] <41898282+claude[bot]@users.noreply.github.com>

packages/twenty-server/src/engine/core-modules/twenty-config/config-variables.ts

@@ -479,7 +479,10 @@ export class ConfigVariables {
   })
   @IsOptional()
   @CastToUpperSnakeCase()
-  LOGIC_FUNCTION_TYPE: LogicFunctionDriverType = LogicFunctionDriverType.LOCAL;
+  LOGIC_FUNCTION_TYPE: LogicFunctionDriverType =
+    process.env.NODE_ENV === NodeEnvironment.DEVELOPMENT
+      ? LogicFunctionDriverType.LOCAL
+      : LogicFunctionDriverType.DISABLED;
 
   @ConfigVariablesMetadata({
     group: ConfigVariablesGroup.LOGIC_FUNCTION_CONFIG,
@@ -598,7 +601,9 @@ export class ConfigVariables {
   @IsOptional()
   @CastToUpperSnakeCase()
   CODE_INTERPRETER_TYPE: CodeInterpreterDriverType =
-    CodeInterpreterDriverType.DISABLED;
+    process.env.NODE_ENV === NodeEnvironment.DEVELOPMENT
+      ? CodeInterpreterDriverType.LOCAL
+      : CodeInterpreterDriverType.DISABLED;
 
   @ConfigVariablesMetadata({
     group: ConfigVariablesGroup.CODE_INTERPRETER_CONFIG,