feat: --mode local 一键本地模式 (SQLite + redka, 无需 MySQL/Redis)

- main.go: --mode local 自动配置 db-driver=sqlite, db-name=data/sqlite3.db, redis-driver=redka
- database: 切换纯 Go SQLite 驱动 (github.com/glebarez/sqlite) — 无需 CGO
- docker-compose.yml: backend 添加 MODE=${MODE:-release} env var + data 卷挂载
- run.sh: binary upgrade 默认 --mode local, config.yaml 模板更新为 local 模式
- K8s quick-deploy.yaml: 单容器部署, MODE=local 环境变量切换远程/本地

backend/go.sum

@@ -22,6 +22,8 @@ github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc h1:U9qPSI2PIWSS1
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@@ -32,6 +34,10 @@ github.com/gin-contrib/sse v0.1.0 h1:Y/yl/+YNO8GZSjAhjMsSuLt29uWRFHdHYUb5lYOV9qE
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@@ -55,6 +61,8 @@ github.com/google/go-cmp v0.5.5/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/
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@@ -127,6 +135,9 @@ github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2 h1:Jamvg5psRI
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@@ -153,9 +164,9 @@ github.com/stretchr/testify v1.7.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/
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