docs: add solopreneur EXAMPLES.md to platform, coded-workflows, and rpa-workflows skills

[1aifanatic]

Summary

Adds EXAMPLES.md files with real end-to-end solopreneur use cases to three existing skills:

skills/uipath-platform/EXAMPLES.md (4 examples):

• Lead enrichment bot deployment (folder setup, assets, queues, pack/publish/deploy)
• Batch invoice processing pipeline (storage buckets, credential assets, queue monitoring)
• CI/CD pipeline for automated deployment (GitHub Actions snippet with non-interactive login)
• Multi-environment asset management (Dev/Staging/Production folder pattern)

skills/uipath-coded-workflows/EXAMPLES.md (5 examples):

• Invoice data extraction + Excel export (using excel service)
• Gmail → Airtable lead capture (using mail service + REST API)
• Queue-based batch processor (queue item lifecycle with Successful/Failed status)
• Slack daily summary report (webhook POST)
• Excel to REST API data sync (row-by-row processing with skip logic)

skills/uipath-rpa-workflows/EXAMPLES.md (4 examples + patterns table):

• Web form auto-fill from Excel (full project setup + indicate flow)
• Automated invoice download from supplier portals
• Legacy desktop app data entry (AttachWindow + SimulateType pattern)
• Scheduled web scraping for competitor price monitoring (with cron trigger via REST API)

Motivation

The existing skills explain how to use UiPath APIs and CLI commands but lack concrete, complete examples that show what to build. Solopreneurs and first-time users benefit most from seeing a full workflow from project creation to running output, using realistic scenarios they'll encounter in their businesses.

Test plan

• Verify all uip CLI commands in examples match current CLI syntax
• Verify C# code examples follow conventions from uipath-coded-workflows SKILL.md (correct service names, package names)
• Verify XAML structure patterns are consistent with uipath-rpa-workflows SKILL.md conventions
• Verify Orchestrator REST API examples match patterns in uipath-platform SKILL.md