feat: ERD 자동 생성 시스템 구축 및 모델 오류 수정

- GraphViz 설치를 통한 ERD 다이어그램 생성 지원
- BelongsToTenantTrait → BelongsToTenant 트레잇명 수정
- Estimate, EstimateItem 모델의 인터페이스 참조 오류 해결
- 60개 모델의 완전한 관계도 생성 (graph.png, 4.1MB)
- beyondcode/laravel-er-diagram-generator 패키지 활용

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

composer.lock

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@@ -7373,6 +7373,69 @@
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             "time": "2025-07-17T06:07:30+00:00"
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+                "nikic/php-parser": "^4.0|^5.0",
+                "php": "^8.2",
+                "phpdocumentor/graphviz": "^1.0"
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+                "orchestra/testbench": "^8.0|^9.0|^10.0",
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+                    "name": "Marcel Pociot",
+                    "email": "marcel@beyondco.de",
+                    "homepage": "https://beyondcode.de",
+                    "role": "Developer"
+                }
+            ],
+            "description": "Generate ER diagrams from your Laravel models.",
+            "homepage": "https://github.com/beyondcode/laravel-er-diagram-generator",
+            "keywords": [
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+            "time": "2025-06-13T13:53:45+00:00"
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@@ -8906,6 +8969,51 @@
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             "time": "2022-02-21T01:04:05+00:00"
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+            "autoload": {
+                "psr-0": {
+                    "phpDocumentor": [
+                        "src/",
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+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
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+            "authors": [
+                {
+                    "name": "Mike van Riel",
+                    "email": "mike.vanriel@naenius.com"
+                }
+            ],
+            "support": {
+                "issues": "https://github.com/phpDocumentor/GraphViz/issues",
+                "source": "https://github.com/phpDocumentor/GraphViz/tree/master"
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+            "time": "2016-02-02T13:00:08+00:00"
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