phsl / new-api

- Added a new GeneralSetting struct to manage configurable docs link
- Removed hardcoded ChatLink and ChatLink2 variables across multiple files
- Updated frontend components to dynamically render docs link from status
- Simplified chat and link-related logic in various components
- Added a warning modal for quota per unit setting in operation settings

feat: Improve decimal precision for quota and payment calculationsDecimal

- Added github.com/shopspring/decimal for precise floating-point calculations
- Refactored quota and payment calculations in multiple files to use decimal arithmetic
- Updated go.mod and go.sum to include decimal library
- Improved precision in topup, relay, and quota service calculations
- Added support for more OpenAI model variants in cache ratio settings

feat: Add column visibility settings for Channels and Logs tables

- Implemented dynamic column visibility for ChannelsTable and LogsTable
- Added localStorage persistence for column preferences
- Introduced column selector modal with select all/reset functionality
- Supported role-based default column visibility
- Added column settings button to table interfaces

feat: Add prompt cache hit tokens support for DeepSeek channel #406

chore: Update terminology from "cache ratio" to "cache multiplier" in UI and add placeholder for default create cache ratio

chore: Update terminology from "cache ratio" to "cache multiplier" in UI and add placeholder for default create cache ratio

feat: Implement cache token ratio for more precise token pricing

fix: adapting return format for openrouter think content (#793)

fix: possible incomplete return of the think field and incorrect occurrences of the `reasoning` field