Add configurable admin password via environment variable

- Add ORCHARD_ADMIN_PASSWORD env var to set initial admin password
- When set, admin user created without forced password change
- Add AWS Secrets Manager support for stage/prod deployments
- Add .env file support for local docker development
- Add Helm chart auth config (adminPassword, existingSecret, secretsManager)

Environments configured:
- Local: .env file or defaults to changeme123
- Feature/dev: orchardtest123 (hardcoded in values-dev.yaml)
- Stage: AWS Secrets Manager (orchard-stage-creds)
- Prod: AWS Secrets Manager (orch-prod-creds)

CHANGELOG.md

@@ -7,6 +7,15 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 ### Added
+- Added `ORCHARD_ADMIN_PASSWORD` environment variable to configure initial admin password (#87)
+  - When set, admin user is created with the specified password (no password change required)
+  - When not set, defaults to `changeme123` and requires password change on first login
+- Added Helm chart support for admin password via multiple sources (#87):
+  - `orchard.auth.adminPassword` - plain value (creates K8s secret)
+  - `orchard.auth.existingSecret` - reference existing K8s secret
+  - `orchard.auth.secretsManager` - AWS Secrets Manager integration
+- Added `.env.example` template for local development (#87)
+- Added `.env` file support in docker-compose.local.yml (#87)
 - Added Project Settings page accessible to project admins (#65)
   - General settings section for editing description and visibility
   - Access Management section (moved from project page)