feat: convert DatabaseType from enum to string-based struct

[datlechin]

Summary

• Converts DatabaseType from a closed 11-case enum to a Hashable/Codable/Sendable string-based struct, enabling future plugins to register new database types without modifying the app
• Replaces all switch-based computed properties with static dictionary/set lookups that return sensible defaults for unknown types
• Adds allKnownTypes array (with allCases compatibility shim), init?(validating:) failable initializer, and availableDatabaseTypes on PluginManager

Changes

Core conversion (DatabaseConnection.swift):

• struct DatabaseType with let rawValue: String, static constants for all 11 built-in types
• Explicit Codable (bare string encoding), Hashable, Sendable conformance
• All computed properties (pluginTypeId, iconName, defaultPort, requiresAuthentication, supportsForeignKeys, supportsSchemaEditing, isDownloadablePlugin) use dictionary/set lookups with defaults for unknown types

Switch statements (~15 files):

• Converted all switch on DatabaseType to if/else chains or dictionary lookups with default: fallbacks

Call site updates (3 files):

• ConnectionFormView: allCases → allKnownTypes
• DeeplinkHandler: DatabaseType(rawValue:) → DatabaseType(validating:) + allKnownTypes
• ConnectionStorage: removed ?? .mysql fallback (init is now non-failable)

Infrastructure:

• PluginManager.availableDatabaseTypes computed property (ready for Phase 4.2)
• Theme.defaultDatabaseColor for unknown type fallback

Tests (3 files):

• Updated existing tests for struct API
• Added 7 new tests: struct equality, unknown type round-trip, validating init, Codable round-trip (known + unknown), Hashable set membership

Test plan

• Build succeeds (xcodebuild build)
• All DatabaseType tests pass (DatabaseTypeTests, DatabaseTypeMSSQLTests, DatabaseTypeRedisTests)
• No DatabaseType.allCases references remain in app code
• No CaseIterable conformance on DatabaseType
• Manual: open app, create connections of different types, verify icons/ports/colors display correctly

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 1f8dff86-1df0-406b-81b7-98461c564a19

📥 Commits

Reviewing files that changed from the base of the PR and between 6c3da7d and 2332b31.

📒 Files selected for processing (19)

• CHANGELOG.md
• CLAUDE.md
• TablePro/Core/ChangeTracking/SQLStatementGenerator.swift
• TablePro/Core/Database/DatabaseDriver.swift
• TablePro/Core/Plugins/PluginManager.swift
• TablePro/Core/Services/Infrastructure/DeeplinkHandler.swift
• TablePro/Core/Storage/ConnectionStorage.swift
• TablePro/Core/Utilities/Connection/ConnectionURLFormatter.swift
• TablePro/Core/Utilities/SQL/SQLParameterInliner.swift
• TablePro/Models/Connection/DatabaseConnection.swift
• TablePro/Theme/Theme.swift
• TablePro/ViewModels/DatabaseSwitcherViewModel.swift
• TablePro/Views/Connection/ConnectionFormView.swift
• TablePro/Views/Export/ExportDialog.swift
• TablePro/Views/Main/Extensions/MainContentCoordinator+Navigation.swift
• TablePro/Views/Structure/TypePickerContentView.swift
• TableProTests/Models/DatabaseTypeMSSQLTests.swift
• TableProTests/Models/DatabaseTypeRedisTests.swift
• TableProTests/Models/DatabaseTypeTests.swift

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feat/open-database-type-struct

📝 Coding Plan

• Generate coding plan for human review comments

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