Implement Lobster PIM Legacy REST API client with authentication, job control, and protocol access

- Added `rest_api` module with client and authentication classes.
- Implemented `LobsterRestApiClient` for interacting with the REST API.
- Created models for job and protocol responses using Pydantic.
- Developed examples demonstrating basic usage, API token authentication, job execution, and error handling.
- Added unit tests for authentication and client methods, including error handling scenarios.

README.md

@@ -109,6 +109,62 @@ config = ElytraConfig.from_env()
 client = ElytraClient(base_url=config.base_url, api_key=config.api_key)
 ```
 
+## Legacy REST API (Lobster PIM)
+
+The package also includes a subpackage for the older Lobster PIM REST API, which provides access to scheduled jobs and protocol logs that are not yet available in the newer API.
+
+### Quick Start
+
+```python
+from elytra_client.rest_api import LobsterRestApiClient, RestApiAuth
+
+# Create authentication
+auth = RestApiAuth.from_username_password("username", "password")
+
+# Create client for the REST API
+client = LobsterRestApiClient("http://lobster-server:8080", auth=auth)
+
+# Get all active jobs
+jobs = client.get_all_active_jobs()
+for job in jobs.jobInfoObjects:
+    print(f"Job: {job.name} - Status: {job.status}")
+
+# Execute a job
+result = client.execute_job(job_id=123)
+print(f"Execution started with runtime ID: {result.runtimeId}")
+
+# Get protocol/logs
+protocols = client.get_protocols()
+```
+
+### Features
+
+- 📋 **Job Management**: Access, monitor, and execute scheduled jobs
+- 📜 **Protocol/Logs**: Retrieve execution logs and protocol information
+- 🔐 **Flexible Authentication**: Username/password or API token authentication
+- ⏳ **Job Control**: Execute jobs with parameter overrides and queue management
+- 🎯 **Type Safety**: Full Pydantic validation for all responses
+
+### Authentication Methods
+
+```python
+# Username/Password
+auth = RestApiAuth.from_username_password("admin", "password")
+
+# API Token (domain-specific)
+auth = RestApiAuth.from_api_token("admin", "token-id", domain="Jobs")
+```
+
+### Documentation
+
+See [elytra_client/rest_api/README.md](elytra_client/rest_api/README.md) for comprehensive REST API documentation, including:
+- Complete API reference
+- Authentication details
+- Job management examples
+- Protocol/log access
+- Error handling
+- Common usage scenarios
+
 ## API Methods
 
 All methods return Pydantic models with full type validation and IDE autocompletion support.