chore: bump version to 0.15.0

[laipz8200]

✨ What’s New in v0.15.0? ✨

Hey developers! We know you've got a lot going on, so let's cut to it. Here's what's new in v0.15.0, our latest release, packed with bug fixes, feature upgrades, and enhancements.

⚡ New Features

🧑‍🧑‍🧒‍🧒 Parent-child Retrieval

Leverage a two-tier hierarchical approach that effectively balances the trade-off between accurate matching and comprehensive contextual information to improve the quality and accuracy of AI-generated responses in RAG systems. Learn more

Highlights:

• The new chunk editing and preview display brings users a better reading and editing experience, making it easier for people without technical backgrounds to understand the two-layer parent-child structure.
• We allow users to improve retrieval efficiency by child chunks independently without changing parent chunks as LLM content.
• Update index mode rules: Economical cannot be downgraded once upgraded to High Quality.
• Document batch operations in Knowledge Base support batch enabling, disabling, deletion, and archiving document functions.

✨ Improvements

• Multi-Version Workflows: Manage multiple workflow versions more effectively with contributions from @warren830 ([feat] Support Multi-Version Workflows #11990).
• UI/UX adjustments for accessibility, such as replacing div with button to enhance user interaction and navigation (@TinsFox, refactor: replace div with button for better accessibility #12046).
• Database and memory optimizations that not only improve performance but they'll likely save you headaches when loading and retrieving data (@laipz8200, refactor: optimize database usage #12071).
• Enhanced support for streaming modes, error feedback, and token handling to improve your coding life significantly (various contributors).

🛠️ Fixes

• Numerous typo fixes, improved error handling, and bug resolutions across the workflow, such as tool can not run, HTTP method case sensitivity by @yihong0618 (fix: tool can not run #12054, fix: http method can be upper case and lower case close #11877 #12401), and cleaning up exceptions by @acelyc111 (refactor: simplify some exception catch code #12246). Your workflow should be a lot smoother now.
• Improved error management in several components. This includes better handling of invalid URLs, file uploads, JSON parsing, and missing IDs, thanks to contributions from @laipz8200 (various PRs).
• Default value fixes to configurations like Google Storage and better formatting of URLs to keep Docker Compose happy, by @kazukitakamatsu and @cemremengu (fix: default value of google storage sa to empty #12188, fix: unquote urls in docker-compose.yaml #12072).

⚙️ Refactoring & Other Chores

• Code refactoring to enhance readability and maintainability like using tiktoken for token calculations (@laipz8200, refactor: use tiktoken for token calculation #12416).
• Cleanup of unused imports for a leaner codebase. Thanks to @bowenliang123 for lint corrections (chore(lint): correct allowed-unused-imports settings for cleanup unused imports in tests #11922).
• A bundle of localization improvements for international users, meticulously handled by the community, including corrections to error messages and localizations (@HanqingZ, Modify jp translation #12292).

⚡ Misc

• Added cheaper and long context models for Qwen2.5-72B-Instruct, and a variety of speech models from siliconflow, contributed by @senseb (Fixes #12414: Add cheaper model and long context model for Qwen2.5-72B-Instruct from siliconflow #12415, add fish-speech-1.5 from siliconflow #12425).
• Squashing bugs related to document parsing that maintained your data format integrity, addressed by @Hisir0909 (Fix newline characters in tables during document parsing #12112).

Get ready to dive into these enhancements and see how they can supercharge your workflows and development experience. Happy coding!