Add Connection Management Types and OAuth Support to SDK (#71)

## Summary

Enhances the auto-generated SDK layer with comprehensive connection
management types and OAuth support, adding ~970 lines of new type
definitions and SDK methods. This lays the groundwork for managing
third-party integrations and authentication flows within the
application.

## Changes

### `sdk/types.gen.ts` (+758 lines)
- Added extensive type definitions for connection management entities
(connections, connection configs, OAuth credentials, integration
metadata)
- Introduced types for OAuth authorization flows, token handling, and
credential storage
- Added request/response types for CRUD operations on connections and
connection configurations
- Defined types for integration catalogs, provider schemas, and
supported authentication methods
- Added error response types and validation schemas for
connection-related endpoints

### `sdk/sdk.gen.ts` (+222 lines)
- Added new SDK client methods for connection lifecycle management
(create, read, update, delete, list)
- Implemented OAuth flow initiation and callback handling methods
- Added methods for managing connection configurations and retrieving
integration metadata
- Wired up proper request/response type mappings for all new endpoints

### `sdk/index.ts` (+4/-4)
- Updated barrel exports to expose new connection management and OAuth
types/methods

## Key Improvements
- **Connection CRUD**: Full lifecycle management for third-party service
connections
- **OAuth Support**: Type-safe OAuth authorization flow handling
including token refresh patterns
- **Integration Catalog**: Typed access to available integrations and
their configuration schemas
- **Developer Experience**: Strongly-typed SDK methods with proper
request/response inference

## Breaking Changes
- Minor modifications to existing exports in `sdk/index.ts` — consumers
importing wildcard (`*`) from the SDK barrel may see new symbols; no
removals detected, but verify that no existing type names collide with
the newly introduced types.

## Testing Notes for Reviewers
- **Type Validation**: Verify TypeScript compilation passes cleanly with
`tsc --noEmit` — ensure no conflicting or duplicate type names across
the SDK surface
- **Generated Code Consistency**: These files appear to be
auto-generated (`.gen.ts` suffix). Confirm the generation source (e.g.,
OpenAPI spec) is committed or referenced, and that manual edits were not
made to generated files
- **Runtime Verification**: Test that new SDK methods correctly call the
expected API endpoints with proper serialization by exercising at least
one connection CRUD flow and one OAuth initiation flow
- **Integration Tests**: If an API sandbox/mock is available, validate
the full OAuth round-trip (initiate → callback → token storage →
refresh)
- **Tree-shaking**: Confirm that the +970 lines of new code are properly
tree-shakeable and don't inflate client bundles for consumers not using
connection features

## Browser Compatibility Considerations
- No direct DOM or browser API usage introduced — changes are purely
TypeScript types and fetch-based SDK methods
- OAuth redirect flows will depend on `window.location` handling at the
consuming layer (not in this PR), so no browser-specific concerns here
- Ensure that any OAuth popup/redirect patterns built on top of these
SDK methods account for cross-browser popup blocker behavior and
Safari's strict ITP (Intelligent Tracking Prevention) policies for
third-party cookies

---
🤖 Generated with [Claude Code](https://claude.ai/code)

**Branch Info:**
- Source: `feature/connection-management`
- Target: `main`
- Type: feature

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

Author: jfrench9