revert: tea 1.0 rewrite (#1122–#1126) (#1146)

Reverts #1126, #1125, #1124, #1123 and #1122.

`go.mod` keeps the Go 1.26 line with toolchain `go1.26.9` (instead of the original `go1.26.6`) so the security fix from #1131 isn't lost.

reopens #69
reopens #141
reopens #162
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reopens #1118

Reviewed-on: https://gitea.com/gitea/tea/pulls/1146
Reviewed-by: TheFox0x7 <95654+thefox0x7@noreply.gitea.com>

modules/version/version.go

@@ -0,0 +1,44 @@
+// Copyright 2026 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package version
+
+import (
+	"fmt"
+	"runtime"
+	"strings"
+)
+
+// Version holds the current tea version.
+// This is set at build time via ldflags.
+// If the Version is moved to another package or name changed,
+// build flags in .goreleaser.yaml or Makefile need to be updated accordingly.
+var Version = "development"
+
+// Tags holds the build tags used
+var Tags = ""
+
+// SDK holds the sdk version from go.mod
+var SDK = ""
+
+// Format returns a human-readable version string including
+// go version, build tags, and SDK version when available.
+func Format() string {
+	s := fmt.Sprintf("Version: %s\tgolang: %s",
+		bold(Version),
+		strings.ReplaceAll(runtime.Version(), "go", ""))
+
+	if len(Tags) != 0 {
+		s += fmt.Sprintf("\tbuilt with: %s", strings.ReplaceAll(Tags, " ", ", "))
+	}
+
+	if len(SDK) != 0 {
+		s += fmt.Sprintf("\tgo-sdk: %s", SDK)
+	}
+
+	return s
+}
+
+func bold(t string) string {
+	return fmt.Sprintf("\033[1m%s\033[0m", t)
+}