Preserve frame position order for auto insertion

- Allow system frame position percentages to keep two decimal places without reordering saved values.

- Stop frontend and backend settings normalization from sorting framePositions on load or save.

- Capture automatic video frames in timeline order while retaining each configured position index.

- Insert automatically selected frames into report placeholders according to the configured percentage order.

- Add frame position utilities and unit coverage for two-decimal rounding, clamping, order preservation, and timeline capture planning.

- Update README, AGENTS, feature, requirement, report editor, system settings, progress, and testing docs for the new frame ordering behavior.

server/src/settings/settings.service.ts

@@ -272,8 +272,7 @@ export class SettingsService {
       ...(input.aiProviders || {}),
     };
     const framePositions = [...(input.framePositions || DEFAULT_SETTINGS.framePositions)]
-      .map((value) => Math.round(value * 10) / 10)
-      .sort((a, b) => a - b);
+      .map((value) => Math.round(value * 100) / 100);
 
     return {
       ...DEFAULT_SETTINGS,