feat: Flutter SDK update for version 25.3.0

[ChiragAgg5k]

This PR contains updates to the SDK for version 25.3.0.

What's Changed

• Added: Client.setBearer() method for OAuth access token authentication
• Added: Query.vectorDot, Query.vectorCosine, Query.vectorEuclidean vector similarity query methods
• Added: appwrite value to OAuthProvider enum
• Added: Locale model fields: city, timeZone, postalCode, latitude, longitude, ISP and connection details
• Updated: Log model docs now include hidden user type

[greptile-apps]

Greptile Summary

This PR bumps the Flutter SDK to version 25.3.0, adding OAuth bearer token authentication, three vector similarity query methods, an appwrite OAuth provider enum value, and eleven new optional fields on the Locale model.

• setBearer(): Added to Client, ClientBase, ClientBrowser, and ClientIO; both platform implementations correctly set the Authorization: Bearer <token> header.
• Vector queries: vectorDot, vectorCosine, and vectorEuclidean follow the same [vector] wrapping convention used by existing geo query methods (intersects, crosses, etc.), producing the expected nested JSON structure via toJson().
• Locale model: New fields (city, timeZone, postalCode, latitude, longitude, ASN/ISP/connection details) are all nullable with consistent ?.toString() / ?.toDouble() parsing in fromMap.

Confidence Score: 5/5

The PR is safe to merge — all changes are additive, follow established conventions, and no existing behaviour is altered.

Changes are purely additive: new methods, new enum value, new nullable model fields, and a version bump. Each implementation follows the exact same pattern as its nearest neighbour in the codebase, and the Bearer prefix is correctly formatted in both client implementations.

No files require special attention.

Important Files Changed

Filename	Overview
lib/query.dart	Adds vectorDot, vectorCosine, and vectorEuclidean query methods; follows the same [vector] wrapping pattern as existing geo query methods (intersects, crosses, etc.).
lib/src/client_base.dart	Adds abstract setBearer(value) override; follows existing untyped-parameter pattern used throughout this file.
lib/src/client_browser.dart	Implements setBearer with correct "Bearer $value" Authorization header; also bumps x-sdk-version to 25.3.0.
lib/src/client_io.dart	Implements setBearer with correct "Bearer $value" Authorization header; also bumps x-sdk-version to 25.3.0.
lib/src/models/locale.dart	Adds 11 new optional fields (city, timeZone, postalCode, lat/long, ASN, ISP, connection info); all correctly typed as nullable with appropriate fromMap/toMap handling.
lib/src/enums/o_auth_provider.dart	Adds appwrite OAuth provider in correct alphabetical position in the enum.
lib/src/models/log.dart	Doc-only change: adds 'hidden' to the list of possible userType values.
pubspec.yaml	Version bumped from 25.2.0 to 25.3.0; consistent with changes in README.md, client headers, and CHANGELOG.
test/src/models/execution_list_test.dart	Adds missing import for enums.dart; no logic changes.
CHANGELOG.md	Documents all 25.3.0 additions accurately.

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