This commit reorganizes several files and updates dependencies to enhance project structure and efficiency:

- Moved files:
  - AccAuthPool.go to AccessTokenPool.go
  - AccTokens.go to AccTokens.go
  - apiReq.go to apiReq.go
  - apiRespJson.go to apiRespJson.go
  - apiRespStream.go to apiRespStream.go
  - chatReq.go to chatReq.go
  - chatResp.go to chatResp.go
  - completions.go to completions.go
  - FreeChat.go to FreeChat.go

- Updated Docker build YAML:
  - Fixed typo in cache-from option.
  - Modified cache-to to correct syntax.

- Refactored common.go:
  - Removed unused imports and functions.
  - Added logger configuration options for improved logging performance.

- Updated config.go:
  - Corrected import path for AccessTokenPool.

- Updated FreeChat.go:
  - Updated import paths to reflect AccessTokenPool.

- Updated go.mod and go.sum:
  - Updated dependencies for tls_client_httpi, tls-client, and go-logger.

These changes optimize file structure, correct configuration settings, and update dependencies to latest versions for better project maintenance and performance.

… and `util.go`

- Fixed syntax issues and added `ForceUseSse` and `FaceUseSse` fields in `chatReq.go`.
- Initialized `ForceUseSse` as `false` and `FaceUseSse` as `true` in `util.go`.

- Added YAML tags (`yaml:"token,omitempty"`, `yaml:"expires_at,omitempty"`, `yaml:"-"`) to `Token`, `ExpiresAt`, and `CanUseAt` fields in `AccessTokenPool.go`.
- Renamed methods:
  - `AddToken` to `AddAccessToken` in `AccessTokenPool.go`.
  - `AppendTokens` to `AppendAccessTokens` in `AccessTokenPool.go`.
- Introduced `IsFileExist` and `ReadFile` functions in `common.go` to handle file existence check and file reading, respectively.
- Updated `config.go` to use `TokensFile` instead of `AccessTokens` and load tokens from the file specified in `TOKENS_FILE`.
- Adjusted README.md to reflect changes related to `TOKENS_FILE` and removed references to `ACCESS_TOKENS`.
- Modified `util.go` to update `ForceUseSse` and `FaceUseSse` values.

These changes optimize YAML handling, improve file operations, and update method names for clarity and consistency.

…ml` to `.yml`

fix: enhance conditional logic in `AccessTokenPool.go` to include expiration check

refactor: improve `FreeChat.go` to handle token retrieval and error case more efficiently

docs: update README.md for clarity on token usage and error handling

Updated `go.mod` and `go.sum` to reflect changes:
- Removed `github.com/gorilla/websocket v1.5.1` from `go.mod`.
- Added `gopkg.in/yaml.v3 v3.0.1` to `go.mod`.
- Removed entries for `github.com/donnie4w/go-logger v0.24.1` from `go.sum`.
- Removed `github.com/gorilla/websocket v1.5.1` entries from `go.sum`.

Adjusted deployment option from Koyeb to Vercel and added Vercel deployment button.