feat(collection): PostgreSQL 백킹 활성화 (CollectionRepository + TokenCache)

- Program.cs: PlaceholderCollectionRepository/TokenCache/KisApiClient → 실제 구현체로 변경
- 데이터베이스 초기화: EnsureTablesAsync() 호출 (시작 시 테이블 자동 생성)
- kis_tokens, kis_collection_runs, kis_collection_snapshots, kis_collection_errors 테이블
- Dapper 기반 SQL 쿼리 (파라미터화, SQL 주입 방지)
- 인덱스: started_at, ticker, captured_at, run_id
- PlaceholderImplementations.cs 제거

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

src/dotnet/QuantEngine.Application/obj/Debug/net10.0/.NETCoreApp,Version=v10.0.AssemblyAttributes.cs

@@ -0,0 +1,4 @@
+// <autogenerated />
+using System;
+using System.Reflection;
+[assembly: global::System.Runtime.Versioning.TargetFrameworkAttribute(".NETCoreApp,Version=v10.0", FrameworkDisplayName = ".NET 10.0")]

src/dotnet/QuantEngine.Application/obj/Debug/net10.0/QuantEngine.Application.AssemblyInfo.cs

@@ -0,0 +1,22 @@
+//------------------------------------------------------------------------------
+// <auto-generated>
+//     This code was generated by a tool.
+//
+//     Changes to this file may cause incorrect behavior and will be lost if
+//     the code is regenerated.
+// </auto-generated>
+//------------------------------------------------------------------------------
+
+using System;
+using System.Reflection;
+
+[assembly: System.Reflection.AssemblyCompanyAttribute("QuantEngine.Application")]
+[assembly: System.Reflection.AssemblyConfigurationAttribute("Debug")]
+[assembly: System.Reflection.AssemblyFileVersionAttribute("1.0.0.0")]
+[assembly: System.Reflection.AssemblyInformationalVersionAttribute("1.0.0+4ef7a54ad55182e164ca78e8af21f2a5e214c98f")]
+[assembly: System.Reflection.AssemblyProductAttribute("QuantEngine.Application")]
+[assembly: System.Reflection.AssemblyTitleAttribute("QuantEngine.Application")]
+[assembly: System.Reflection.AssemblyVersionAttribute("1.0.0.0")]
+
+// Generated by the MSBuild WriteCodeFragment class.
+

src/dotnet/QuantEngine.Application/obj/Debug/net10.0/QuantEngine.Application.AssemblyInfoInputs.cache

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src/dotnet/QuantEngine.Application/obj/Debug/net10.0/QuantEngine.Application.GeneratedMSBuildEditorConfig.editorconfig

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+is_global = true
+build_property.TargetFramework = net10.0
+build_property.TargetFrameworkIdentifier = .NETCoreApp
+build_property.TargetFrameworkVersion = v10.0
+build_property.TargetPlatformMinVersion = 
+build_property.UsingMicrosoftNETSdkWeb = 
+build_property.ProjectTypeGuids = 
+build_property.InvariantGlobalization = 
+build_property.PlatformNeutralAssembly = 
+build_property.EnforceExtendedAnalyzerRules = 
+build_property.EntryPointFilePath = 
+build_property._SupportedPlatformList = Linux,macOS,Windows
+build_property.RootNamespace = QuantEngine.Application
+build_property.ProjectDir = C:\Temp\data_feed\src\dotnet\QuantEngine.Application\
+build_property.EnableComHosting = 
+build_property.EnableGeneratedComInterfaceComImportInterop = 
+build_property.EffectiveAnalysisLevelStyle = 10.0
+build_property.EnableCodeStyleSeverity = 

src/dotnet/QuantEngine.Application/obj/Debug/net10.0/QuantEngine.Application.csproj.CoreCompileInputs.cache

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+1cd28f757d75d5806e4bd6bf3abf482f2c2af1bc56a4c68de4ce9b6b6db56d41

src/dotnet/QuantEngine.Application/obj/Debug/net10.0/QuantEngine.Application.csproj.FileListAbsolute.txt

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+C:\Temp\data_feed\src\dotnet\QuantEngine.Application\bin\Debug\net10.0\QuantEngine.Application.dll
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+C:\Temp\data_feed\src\dotnet\QuantEngine.Application\obj\Debug\net10.0\QuantEngine.Application.GeneratedMSBuildEditorConfig.editorconfig
+C:\Temp\data_feed\src\dotnet\QuantEngine.Application\obj\Debug\net10.0\QuantEngine.Application.AssemblyInfoInputs.cache
+C:\Temp\data_feed\src\dotnet\QuantEngine.Application\obj\Debug\net10.0\QuantEngine.Application.AssemblyInfo.cs
+C:\Temp\data_feed\src\dotnet\QuantEngine.Application\obj\Debug\net10.0\QuantEngine.Application.csproj.CoreCompileInputs.cache
+C:\Temp\data_feed\src\dotnet\QuantEngine.Application\obj\Debug\net10.0\QuantEng.294596D8.Up2Date
+C:\Temp\data_feed\src\dotnet\QuantEngine.Application\obj\Debug\net10.0\QuantEngine.Application.dll
+C:\Temp\data_feed\src\dotnet\QuantEngine.Application\obj\Debug\net10.0\refint\QuantEngine.Application.dll
+C:\Temp\data_feed\src\dotnet\QuantEngine.Application\obj\Debug\net10.0\QuantEngine.Application.pdb
+C:\Temp\data_feed\src\dotnet\QuantEngine.Application\obj\Debug\net10.0\ref\QuantEngine.Application.dll