feat(threshold): Implement customer loss threshold configuration and notification system

- Added `ThresholdRepository` for managing customer loss threshold configurations and notifications.
- Introduced `threshold_service` to handle loss threshold alerts based on customer portfolio performance.
- Enhanced `customer_prompts` to include new intent for querying product net values.
- Updated `customer_service` to integrate new threshold alert functionality into existing workflows.
- Implemented `sanitize_postprocess` for improved compliance handling in customer interactions.
- Enhanced course documentation to reflect updates in advisor training modules and interactive elements.

This update significantly improves the customer experience by providing proactive loss threshold notifications and enhancing the overall service framework.

docs/course/jinrong-module-customer/_base.html

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         <button class="nav-dot" data-target="module-3" data-tooltip="流式与铁律" role="tab" aria-label="模块 3: 流式与铁律"></button>
+        <button class="nav-dot" data-target="module-4" data-tooltip="口吻与转人工" role="tab" aria-label="模块 4: 口吻与转人工"></button>
+        <button class="nav-dot" data-target="module-5" data-tooltip="边界与接缝" role="tab" aria-label="模块 5: 边界与接缝"></button>
+        <button class="nav-dot" data-target="module-6" data-tooltip="L0 与 L1 画像" role="tab" aria-label="模块 6: L0 与 L1 画像"></button>
+        <button class="nav-dot" data-target="module-7" data-tooltip="Wave3 查询" role="tab" aria-label="模块 7: Wave3 查询"></button>
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