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
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reopens #1118

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

modules/task/pull_create_test.go

@@ -0,0 +1,27 @@
+// Copyright 2023 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package task
+
+import "testing"
+
+func TestGetDefaultPRTitle(t *testing.T) {
+	tests := []struct {
+		input string
+		want  string
+	}{
+		{input: "Add new feature", want: "Add New Feature"},
+		{input: "update-docs: Fix typo", want: "Fix Typo"},
+		{input: "remove_long-string", want: "Remove Long String"},
+		{input: "Replace_Underscores_With_Spaces", want: "Replace Underscores With Spaces"},
+		{input: "  leading-and-trailing-spaces ", want: "Leading And Trailing Spaces"},
+		{input: "-----No--Upper--Case-----", want: "No Upper Case"},
+		{input: "", want: ""},
+	}
+	for _, test := range tests {
+		got := GetDefaultPRTitle(test.input)
+		if got != test.want {
+			t.Errorf("GetDefaultPRTitle(%q) = %q, want %q", test.input, got, test.want)
+		}
+	}
+}