feat(tools): add ideas ecosystem with 7 read-only tools and enhance changelog params

[Ompragash]

Introduce full coverage for the Canny Ideas API surface — groups, ideas, insights, and opportunities — as a cohesive 'ideas' toolset. All 7 tools are read-only and use cursor-based pagination where the API requires it, falling back to skip-based for opportunities.

New tools:

• canny_list_groups / canny_get_group: group discovery by cursor or ID/urlName
• canny_list_ideas / canny_get_idea: idea listing with advanced filtering (IdeaFilter objects), full-text search, and configurable sort order
• canny_list_insights / canny_get_insight: qualitative feedback linked to ideas with priority and company attribution
• canny_list_opportunities: Salesforce opportunity data with revenue and win/close state tied to Canny posts and ideas

Infrastructure:

• Add 6 new type interfaces (CannyGroup, CannyIdea, CannyIdeaStatus, IdeaFilter, CannyInsight, CannyOpportunity) to src/types/canny.ts
• Add 7 client methods with cursor/skip response normalization
• Extend ToolsetName union with 'ideas' for granular toolset filtering
• Compact response transformers applied to all list endpoints

Changelog tool enhancements:

• Add 'sort' param to canny_list_changelog_entries (created, lastSaved, nonPublishedFirst, publishedAt)
• Add 'scheduledFor' param to canny_create_changelog_entry for future publication scheduling

Versioning:

• Reorder CHANGELOG.md entries chronologically (newest first)
• Current work targets v1.3.0

Tool count: 30 → 37 (19 read-only, 18 write) across 8 toolsets. Test and documentation updates reflect all new counts.