TEC-687 - Refactor workflow tasks to use @app.task decorator and update SDK usa…

[R4ph-t]

Update examples to Render SDK v0.2.0

Summary

• Migrate all workflow examples to use the new SDK v0.2.0 patterns
• Update documentation to reflect the latest API changes

Changes

Task SDK (Workflow Services)

• Replace from render_sdk.workflows import task, start with from render_sdk import Workflows
• Replace @task decorator with @app.task pattern
• Replace start() with Workflows(auto_start=True) initialization
• Consolidate retry configurations into Workflows default settings

Client SDK (API Service)

• Replace from render_sdk.client import Client with from render_sdk import Render
• Replace Client(api_key=...) with Render() (auto-reads RENDER_API_KEY env var)
• Add TaskRunError for task-specific error handling
• Update task invocation from keyword args to new positional format:
  Old
  client.workflows.run_task(workflow_service_slug="...", task_name="...", input={...})
  New
  await render.workflows.run_task("slug/task-name", {"param": value})

Dependencies

Update all requirements.txt files to render-sdk>=0.2.0

Cleanup

Remove unused from typing import Any imports

[Borets]

Overall lgtm. Seeing only changes to how the SDK is used the rest of the logic is untouched.