fix: add SearchCacheDbContext EF migrations

[ModerRAS]

Summary

• add a design-time factory for SearchCacheDbContext`n- generate dedicated EF Core migration files for the separate SearchCache.sqlite database
• switch startup initialization from EnsureCreatedAsync to MigrateAsync for the search cache database

Why

SearchCacheDbContext was merged without EF Core migration files, so the new cache database was being created outside the repository's normal migration workflow. This PR makes the separate cache database consistent with the rest of the project and keeps its schema under version control.

Validation

• dotnet build TelegramSearchBot.sln -c Release
• dotnet test TelegramSearchBot.sln -c Release --no-build
• dotnet ef migrations list --context SearchCacheDbContext --project TelegramSearchBot.Database --startup-project TelegramSearchBot

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 346613d7-95ec-4aed-a907-987ce109c340

📥 Commits

Reviewing files that changed from the base of the PR and between 72eecc5 and a1d1e5d.

📒 Files selected for processing (5)

• TelegramSearchBot.Database/Migrations/SearchCache/20260421120404_InitSearchCacheDatabase.Designer.cs
• TelegramSearchBot.Database/Migrations/SearchCache/20260421120404_InitSearchCacheDatabase.cs
• TelegramSearchBot.Database/Migrations/SearchCache/SearchCacheDbContextModelSnapshot.cs
• TelegramSearchBot.Database/Model/SearchCacheDbContextFactory.cs
• TelegramSearchBot/AppBootstrap/GeneralBootstrap.cs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/search-cache-migrations

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[github-actions]

🔍 PR检查报告

📋 检查概览

• PR: fix: add SearchCacheDbContext EF migrations #273
• 分支: fix/search-cache-migrations → master
• 触发事件: pull_request
• 提交: ff277cc

🧪 测试结果

平台	状态	详情
Ubuntu	🔴 失败	测试结果不可用
Windows	🔴 失败	测试结果不可用

📊 代码质量

• ✅ 代码格式化检查
• ✅ 安全漏洞扫描
• ✅ 依赖包分析
• ✅ 代码覆盖率收集

📁 测试产物

• 测试结果文件已上传为artifacts
• 代码覆盖率已上传到Codecov

🔗 相关链接

• PR页面
• Actions日志

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