feat: .NET SDK update for version 3.0.0

[ChiragAgg5k]

This PR contains updates to the .NET SDK for version 3.0.0.

What's Changed

• [BREAKING] Renamed Webhook model fields: security → tls, httpUser → authUsername, httpPass → authPassword, signatureKey → secret
• [BREAKING] Renamed Webhook service parameters to match: security → tls, httpUser → authUsername, httpPass → authPassword
• [BREAKING] Renamed Webhooks.UpdateSignature() to Webhooks.UpdateSecret() with new optional secret parameter
• Added Client.GetHeaders() method to retrieve request headers
• Added secret parameter to Webhook create and update methods
• Added x OAuth provider to OAuthProvider enum
• Added userType field to Log model
• Added purge parameter to UpdateCollection and UpdateTable for cache invalidation
• Added Project service: platform CRUD, key CRUD, protocol/service status management
• Added new models: Key, KeyList, Project, DevKey, MockNumber, AuthProvider, PlatformAndroid, PlatformApple, PlatformLinux, PlatformList, PlatformWeb, PlatformWindows, BillingLimits, Block
• Added new enums: PlatformType, ProtocolId, ServiceId
• Updated BuildRuntime, Runtime enums with dart-3.11 and flutter-3.41
• Updated Scopes enum with KeysRead, KeysWrite, PlatformsRead, PlatformsWrite
• Updated X-Appwrite-Response-Format header to 1.9.1
• Updated TTL description for list caching in Databases and TablesDB

[greptile-apps]

Greptile Summary

This PR is a major version bump (2.0.0 → 3.0.0) adding the Project service (key/platform/protocol/service CRUD), new models (Project, Key, DevKey, BillingLimits, Block, platform variants), renames webhook fields (security→tls, signatureKey→secret), and fixes previously-flagged runtime crashes in GetPlatform and GetColumn/GetAttribute by introducing proper type-discrimination switches.

Confidence Score: 5/5

Safe to merge; previously-flagged runtime crashes are resolved and only a P2 usability concern remains.

The two confirmed runtime-crash bugs from prior review rounds (GetPlatform always using PlatformWeb.From(), GetColumn always using ColumnBoolean.From()) are both fixed with proper type-discrimination switches. The only new finding is that Project.Platforms is List rather than a typed or Dictionary list — a usability inconvenience, not a crash. All P0/P1 items are addressed.

Appwrite/Models/Project.cs (Platforms field type); Appwrite/Services/Webhooks.cs (previously flagged missing secret in Update).

Important Files Changed

Filename	Overview
Appwrite/Services/Project.cs	New Project service with full platform and key CRUD; GetPlatform now correctly discriminates platform types via type-switch (previously crashing bug is fixed).
Appwrite/Models/Project.cs	New Project model with all fields; Platforms embedded list is List losing type information for callers receiving a Project response.
Appwrite/Services/Webhooks.cs	Renames security fields to tls/authUsername/authPassword/secret and adds UpdateSecret; Update still omits the secret parameter (previously flagged, CHANGELOG claims it was added).
Appwrite/Services/TablesDB.cs	GetColumn now has correct type-discrimination switch (previously crashing bug is fixed); purge parameter added to UpdateTable.
Appwrite/Services/Databases.cs	GetAttribute now uses correct type-discrimination switch; purge parameter added to UpdateCollection; arrow-to-block-body reformatting throughout.
Appwrite/Services/Messaging.cs	Adds contentAvailable, critical, and priority parameters to CreatePush/UpdatePush; rest is arrow-to-block-body reformatting.
Appwrite/Client.cs	Version bumped to 3.0.0, X-Appwrite-Response-Format updated to 1.9.1, and GetHeaders() method added to expose a copy of request headers.
Appwrite/Models/Webhook.cs	Breaking field renames: security→tls, httpUser→authUsername, httpPass→authPassword, signatureKey→secret; consistent with CHANGELOG.

_{Reviews (7): Last reviewed commit: "chore: update .NET SDK to 3.0.0" | Re-trigger Greptile}