### What this PR does

Before this PR:
- Release v1.8.2 was the latest version
- Several bugs and user-facing issues needed to be addressed

After this PR:
- Version bumped to 1.8.3
- Release notes updated with bilingual changelog
- Release branch created for CI/CD release workflow

Fixes #N/A (release PR)

### Why we need it and why it was done in this way

This is a release PR that triggers the automated release workflow when
merged to main. The workflow builds binaries for macOS, Windows, and
Linux and creates a draft GitHub release.

The following tradeoffs were made:
- Includes only user-facing changes in release notes (internal
refactoring excluded)

The following alternatives were considered:
- N/A

### Breaking changes

None. This is a patch release with backward-compatible bug fixes and
feature additions.

### Special notes for your reviewer

This PR includes the following changes since v1.8.2:

**New Features (5):**
- [Onboarding] Add guided setup flow for new users with CherryIN OAuth
login
- [Code Tools] Add LMStudio and Ollama support for Claude Code
- [Models] Show model IDs for duplicate names in model pickers
- [Agents] Add OpenRouter support for Agent mode
- [Agents] Upgrade Agent SDK with ToolSearch

**Bug Fixes (13):**
- [Code Tools] Fix Windows error with tool update messages
- [Models] Fix OpenClaw config overwriting user settings
- [Paintings] Fix base64 image handling causing HTTP 413 errors
- [Files] Fix CherryAI provider PDF conversion
- [Files] Fix PDF text extraction in production builds
- [Agents] Fix agent chat scroll position memory
- [Startup] Fix app crash from missing canvas binaries
- [Models] Fix Groq multi-turn conversation errors
- [Memory] Fix assistant memory search
- [Citations] Fix Gemini citation over-matching
- [Agents] Fix reasoning effort button display
- [Models] Fix Claude 4.6 max_tokens calculation
- [MCP] Fix MCP tools only working on first prompt

### Checklist

- [x] PR: The PR description is expressive enough and will help future
contributors
- [x] Code: Write code that humans can understand and Keep it simple
- [x] Refactor: You have left the code cleaner than you found it (Boy
Scout Rule)
- [x] Upgrade: Impact of this change on upgrade flows was considered and
addressed if required
- [x] Documentation: A user-guide update was considered and is present
(link) or not required
- [x] Self-review: I have reviewed my own code before requesting review
from others

### Release note

```release-note
Cherry Studio 1.8.3 - New Features and Bug Fixes

✨ New Features
- [Onboarding] Add guided setup flow for new users with CherryIN OAuth login and automatic model configuration
- [Code Tools] Add LMStudio and Ollama support for Claude Code
- [Models] Show model IDs for duplicate names in model pickers
- [Agents] Add OpenRouter support for Agent mode (Claude Code SDK)
- [Agents] Upgrade Agent SDK with ToolSearch for efficient MCP tool discovery

🐛 Bug Fixes
- [Code Tools] Fix Windows error where tool update messages were misinterpreted as commands
- [Models] Fix OpenClaw config overwriting user settings on every restart
- [Paintings] Fix base64 image handling causing HTTP 413 errors in follow-up messages
- [Files] Fix CherryAI provider not converting PDF files to text
- [Files] Fix PDF text extraction failing in production builds
- [Agents] Fix agent chat page not remembering scroll position when switching sessions
- [Startup] Fix app crash caused by missing canvas platform binaries
- [Models] Fix Groq multi-turn conversation errors
- [Memory] Fix assistant memory search returning no results
- [Citations] Fix Gemini citation over-matching with short text segments
- [Agents] Fix reasoning effort button not showing for reasoning models
- [Models] Fix max_tokens calculation for Claude 4.6 models with adaptive thinking
- [MCP] Fix MCP tools only working on the first prompt

💄 Improvements
- [Models] Use the same model popup for Chat and Agent with consistent features
- [Agents] Add revealing animation for agent session renaming
```

**Review Checklist:**
- [ ] Review generated release notes in `electron-builder.yml`
- [ ] Verify version bump in `package.json`
- [ ] CI passes
- [ ] Merge to trigger release build

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

Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>