refactor: replace OpenClaw AI config flow and standardize PR template

[senamakel]

Summary

• Replaced OpenClaw-based AI context injection flow with direct AI configuration retrieval and refresh utilities.
• Refactored chat/config integration points across frontend and Tauri command surfaces to use the new configuration path.
• Simplified AI settings panel behavior around loading and refresh by aligning it to the updated config structure.
• Removed obsolete OpenClaw-specific loader/injector files and related initialization wiring.
• Added and enforced a repository PR template plus authoring guidance updates in docs/agent instructions.

Problem

• The OpenClaw integration path added indirection and stale wiring across chat and settings flows, making AI configuration behavior harder to reason about and maintain.
• Reviewer consistency for PRs was also inconsistent due to missing standardized PR structure.

Solution

• Introduced direct AI configuration retrieval/refresh handling in the Tauri/backend command path and updated frontend call sites accordingly.
• Updated impacted UI/state entry points (Conversations, threadSlice, tauriCommands, AIPanel) to consume the new flow.
• Deleted deprecated OpenClaw loader/injector modules and removed their startup usage.
• Added .github/pull_request_template.md and documented mandatory usage in project AI authoring docs.

Testing

• yarn -s compile
• cargo check --manifest-path src-tauri/Cargo.toml
• Other checks run (list commands)
  • Not run in this branch before opening draft PR.
• Manual validation completed (list scenarios)
  • Not completed yet.

Impact

• Affects desktop/web chat/config wiring and Tauri command integration for AI configuration retrieval.
• Removes legacy OpenClaw code paths, reducing maintenance surface.
• Process impact: future PRs are now expected to use the standardized template.

Breaking Changes

• None
• Yes (describe clearly, including migration steps)

Related

• Issue(s): N/A
• Follow-up PR(s)/TODOs:
  • Run compile/check/manual validation and update this draft with results.