feat: Add 'Case Studies' section to documentation with links to machine vision licensing examples in both Chinese and English

docs/en/guide/cases/machine-vision-licensing.md

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+# Flexible Licensing Solutions for Machine Vision Inspection Software
+
+## Customer Background
+
+An industrial vision inspection software provider delivers solutions across precision manufacturing scenarios including PCB board-level inspection, lithium battery coating defect identification, and 3C component appearance detection.
+
+As their customer base expanded, the traditional "one order, one license" model revealed critical pain points:
+
+- **Coarse licensing granularity**: device- or project-based licensing made it impossible to bill flexibly by inspection station, vision algorithm module, or runtime
+- **Rigid hardware binding**: frequent production line changeovers meant every machine swap required a new license application, driving up operational costs
+- **Monolithic business model**: only perpetual purchase was supported, with no access to rental, installment, or subscription options
+- **High piracy risk**: software could be copied, hardware fingerprints were easily spoofed, and licensing was effectively toothless
+
+## Solution
+
+Built on License Manager's flexible authorization architecture, a multi-layered licensing framework was customized for this provider:
+
+### 1. Fine-Grained Authorization by Algorithm Module
+
+The vision inspection software was broken into independently licensed algorithm modules:
+
+```mermaid
+graph LR
+    A[Vision Inspection Platform] --> B[Basic Positioning Module]
+    A --> C[Defect Detection Module]
+    A --> C1[2D Vision Inspection]
+    A --> C2[3D Point Cloud Inspection]
+    A --> D[Measurement & Calibration Module]
+    A --> E[Deep Learning Module]
+    E --> E1[Model Training]
+    E --> E2[Online Inference]
+```
+
+Modules are independently priced — customers purchase what they need, dramatically lowering the barrier to entry and unlocking cross-sell opportunities. Average modules purchased per customer rose from 1.2 to 2.8.
+
+### 2. Multi-Dimensional Hardware Fingerprint Binding
+
+A composite fingerprint strategy addresses the reality of frequent production line changeovers:
+
+| Binding Level | Fingerprint Sources | Use Case | Changeover Friendliness |
+|---|---|---|---|
+| **Relaxed** | MAC address only | Fixed-station devices | ⭐ |
+| **Standard** | MAC + CPU serial | Standard production lines | ⭐⭐⭐ |
+| **Strict** | MAC + CPU + motherboard + HDD serial | High-security environments | ⭐⭐⭐⭐⭐ |
+
+Changeover quotas are supported: each license period allows N free device swaps, with additional swaps auto-approved upon admin authorization.
+
+### 3. Multi-Tenant Sub-License Management
+
+Large factories typically have independently-accounted business units or subsidiaries. License Manager's tenant hierarchy enables:
+
+- HQ distributes authorization quotas centrally
+- Each business unit manages sub-accounts and device quotas independently
+- Usage and billing tracked per business unit
+
+### 4. Hybrid Authorization Modes
+
+Different network conditions call for different modes:
+
+| Mode | Description | Typical Customer |
+|---|---|---|
+| **Cloud (Online)** | Client connects to license server in real time; validated on every startup | Modern factories with stable connectivity |
+| **Standalone (Offline)** | License file stored locally; runs offline, syncs periodically | Military and classified workshops with no external network |
+| **Hybrid** | Local validation + periodic heartbeat; continues running during network outages | Remote facilities with unreliable connectivity |
+
+### 5. Tamper-Proof Security
+
+- **RSA-PSS-SHA256 signatures**: license files are signed — any modification is immediately detected
+- **AES-256 data encryption**: license content encrypted at rest, preventing direct reading or analysis
+- **Heartbeat verification with dynamic salt**: online mode heartbeats include dynamic salt values, preventing replay attacks
+- **Client code obfuscation**: SDK integration supports code obfuscation to raise the bar on reverse engineering
+
+## Business Outcomes
+
+After 6 months in production:
+
+- **+40% licensing revenue**: module-level pricing raised average modules purchased from 1.2 → 2.8 per customer
+- **−85% changeover tickets**: relaxed binding + changeover quotas dramatically reduced operational overhead
+- **Piracy rate dropped from ~15% to <1%**: hardware fingerprinting + signature verification effectively halted unauthorized copying
+- **Subscription renewal rate: 78%**: rental and subscription models attracted budget-constrained SMEs
+- **Deployment cycle: 2 weeks → 3 days**: standardized deployment packages + bulk import tooling
+
+## Summary
+
+This case demonstrates how License Manager's four core capabilities — **modular authorization design**, **composite hardware fingerprint binding**, **multi-tenant management**, and **hybrid authorization modes** — helped an industrial software provider make the leap from "selling software" to "selling services," boosting revenue while significantly reducing licensing management and operational costs.