Initial implementation of Gitea Wrapped TUI

- Gitea API client with repository and commit fetching
- Interactive credential input screen with masked token input
- Statistics analyzer for commits, languages, and activity patterns
- Multi-page report screen with ASCII charts and visualizations
- Integration of all components in main app coordinator
- Comprehensive README with usage instructions

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

pkg/models/types.go

@@ -0,0 +1,51 @@
+package models
+
+import "time"
+
+type Repository struct {
+	ID       int64
+	Name     string
+	FullName string
+	HTMLURL  string
+	Language string
+	Topics   []string
+}
+
+type Commit struct {
+	SHA       string
+	Message   string
+	Author    string
+	Timestamp time.Time
+	RepoName  string
+}
+
+type LanguageStats struct {
+	Language string
+	Count    int
+	Percent  float64
+}
+
+type DateStats struct {
+	Date   time.Time
+	Count  int
+	Day    string
+}
+
+type TagStats struct {
+	Tag   string
+	Count int
+}
+
+type UserStats struct {
+	Username            string
+	TotalCommits        int
+	TotalRepositories   int
+	Languages           []LanguageStats
+	Tags                []TagStats
+	CommitsByWeekday    []DateStats
+	CommitsByMonth      []DateStats
+	TopRepositories     []Repository
+	MostActiveMonth     string
+	MostActiveDay       string
+	AverageCommitsPerDay float64
+}