feat: opaque session、安装/发帖 SSR 与最小 Admin 后台

浏览器登录改为 DB sessions（可吊销）；敏感词与 OIDC PEM 入 settings；
落地安装向导、注册发帖与 /admin 仪表盘/板块/审核/设置。

Co-authored-by: Cursor <cursoragent@cursor.com>

go.mod

@@ -12,7 +12,8 @@ require (
 	github.com/minio/minio-go/v7 v7.0.98
 	golang.org/x/crypto v0.46.0
 	golang.org/x/image v0.44.0
-	gopkg.in/ini.v1 v1.67.3
+	gorm.io/driver/mysql v1.5.7
+	gorm.io/driver/postgres v1.5.11
 	gorm.io/gorm v1.25.12
 )
 
@@ -30,15 +31,21 @@ require (
 	github.com/go-playground/locales v0.14.1 // indirect
 	github.com/go-playground/universal-translator v0.18.1 // indirect
 	github.com/go-playground/validator/v10 v10.20.0 // indirect
+	github.com/go-sql-driver/mysql v1.7.0 // indirect
 	github.com/goccy/go-json v0.10.2 // indirect
 	github.com/google/uuid v1.6.0 // indirect
 	github.com/gorilla/css v1.0.1 // indirect
+	github.com/jackc/pgpassfile v1.0.0 // indirect
+	github.com/jackc/pgservicefile v0.0.0-20221227161230-091c0ba34f0a // indirect
+	github.com/jackc/pgx/v5 v5.5.5 // indirect
+	github.com/jackc/puddle/v2 v2.2.1 // indirect
 	github.com/jinzhu/inflection v1.0.0 // indirect
 	github.com/jinzhu/now v1.1.5 // indirect
 	github.com/json-iterator/go v1.1.12 // indirect
 	github.com/klauspost/compress v1.18.2 // indirect
 	github.com/klauspost/cpuid/v2 v2.2.11 // indirect
 	github.com/klauspost/crc32 v1.3.0 // indirect
+	github.com/kr/text v0.2.0 // indirect
 	github.com/leodido/go-urn v1.4.0 // indirect
 	github.com/mattn/go-isatty v0.0.20 // indirect
 	github.com/minio/crc64nvme v1.1.1 // indirect
@@ -48,13 +55,16 @@ require (
 	github.com/pelletier/go-toml/v2 v2.2.2 // indirect
 	github.com/philhofer/fwd v1.2.0 // indirect
 	github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec // indirect
+	github.com/rogpeppe/go-internal v1.16.0 // indirect
 	github.com/rs/xid v1.6.0 // indirect
+	github.com/stretchr/testify v1.11.1 // indirect
 	github.com/tinylib/msgp v1.6.1 // indirect
 	github.com/twitchyliquid64/golang-asm v0.15.1 // indirect
 	github.com/ugorji/go/codec v1.2.12 // indirect
 	go.yaml.in/yaml/v3 v3.0.4 // indirect
 	golang.org/x/arch v0.8.0 // indirect
 	golang.org/x/net v0.48.0 // indirect
+	golang.org/x/sync v0.22.0 // indirect
 	golang.org/x/sys v0.39.0 // indirect
 	golang.org/x/text v0.40.0 // indirect
 	google.golang.org/protobuf v1.34.1 // indirect