feat: init go project (#1064)

Author: SAKURA-CAT

.github/workflows/test-core.yml

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+name: Check swanlab-core
+
+on:
+  pull_request:
+    paths:
+      - core/**
+
+
+jobs:
+  check-and-test:
+    strategy:
+      matrix:
+        go: [stable, '1.24.4']
+        os: [ubuntu-latest, macos-latest, windows-latest]
+    name: Check and Test Go Core on ${{ matrix.os }} with Go ${{ matrix.go }}
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Go environment
+        uses: actions/[email protected]
+        with:
+            go-version: ${{ matrix.go }}
+            cache: 'true'
+
+      - name: Golangci-lint
+        uses: golangci/[email protected]
+        with:
+          working-directory: 'core'
+

core/LICENSE

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+../LICENSE

core/README.md

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+<div align="center">
+    <picture>
+      <source media="(prefers-color-scheme: dark)" srcset="../readme_files/swanlab-logo-single-dark.svg">
+      <source media="(prefers-color-scheme: light)" srcset="../readme_files/swanlab-logo-single.svg">
+      <img alt="SwanLab" src="../readme_files/swanlab-logo-single.svg" width="70" height="70">
+    </picture>
+</div>
+
+# swanlab-core: A new backend for SwanLab SDK
+
+To address the challenges posed by Python's asynchronous programming, we introduced swanlab-core, a brand-new, Go-based backend for metric uploading.
+
+
+## IDE & Development Setup
+
+In this part, we will guide you through the process of setting up your IDE and development environment for SwanLab SDK.
+We will use:
+1. [GoLand](https://www.jetbrains.com/go/) as the IDE.
+2. [Go](https://go.dev/) as the programming language.
+3. [golangci-lint](https://golangci-lint.run/) as the linter.
+
+## IDE
+
+We request using GoLand as the IDE for swanlab-core development. 
+It provides a rich set of features for Go development, including code completion, debugging, and integration with version control systems.
+
+There is the code template for Go file in GoLand:
+
+```text
+package ${GO_PACKAGE_NAME}
+
+// @Title        ${FILE_NAME}
+// @Description  
+// @Create       cunyue ${DATE} ${TIME}
+```
+
+## Linter
+
+We use [golangci-lint](https://golangci-lint.run/) as the linter for swanlab-core development.
+Since SwanLab is a Python project, some developers may not be very familiar with the Go language. 
+Therefore, golangci-lint is not mandatory and will only trigger this CI when changes are made to the core part.
+
+If you plan to develop swanlab-core, configure the golangci-lint integration in GoLand, which can be found under Go -> Linter settings.
+
+## Env
+
+TODO
+

core/go.mod

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+module github.com/SwanHubX/SwanLab/core
+
+go 1.24.4

core/internal/api/api.go

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+package api
+
+// @Title        api.go
+// @Description  SwanLab API intended for requests to the SwanLab-Server.
+// @Create       cunyue 2025/6/10 13:00