docs(readme): add PR creation details and update badges

README.md

@@ -2,14 +2,14 @@
 
 # gai
 
-**AI-powered git commit message generator**
+**AI-powered Git commit and pull request helper**
 
-[![Version](https://img.shields.io/badge/version-0.1.0-blue.svg)](https://github.com/mplan/git-ai)
+[![Release](https://img.shields.io/badge/dynamic/json?url=https%3A%2F%2Fgit.catpl.top%2Fapi%2Fv1%2Frepos%2FMplan%2Fgai%2Freleases%2Flatest&query=%24.tag_name&label=release&color=blue)](https://git.catpl.top/Mplan/gai/releases)
 [![License: MIT](https://img.shields.io/badge/license-MIT-green.svg)](./LICENSE)
 [![Bun](https://img.shields.io/badge/runtime-Bun-f9d71c.svg)](https://bun.sh)
 [![TypeScript](https://img.shields.io/badge/lang-TypeScript-3178c6.svg)](https://www.typescriptlang.org/)
 
-Generate **Conventional Commits** messages using AI — based on your project context, code diff, and commit history.
+Generate **Conventional Commits** messages and pull request descriptions using AI, based on your project context, code diff, branch changes, and commit history.
 
 </div>
 
@@ -18,13 +18,14 @@ Generate **Conventional Commits** messages using AI — based on your project co
 ## Features
 
 - **Interactive menu** — `gai` opens a menu, select actions with ↑/↓ + space/enter
-- **3-layer context** — project overview, staged diff, and recent commit history
+- **Context-aware commits** — reads project overview, staged diff, and recent commit history
 - **Conventional Commits** — `feat(scope): description` format by default
 - **Interactive file selection** — ↑/↓ to navigate, space to select, top-level "Select all"
 - **Inline editing** — edit AI-generated messages right in the terminal with cursor movement
-- **OpenAI-compatible API** — works with DeepSeek, OpenAI, Ollama, and more
+- **AI-generated PRs** — create GitHub or Gitea pull requests with generated title and body
+- **OpenAI-compatible API** — works with DeepSeek, OpenAI, Ollama, OpenRouter, and more
 - **Review before commit** — confirm, edit, or abort the generated message
-- **Zero dependencies** — built entirely on Bun native APIs
+- **Bun-native runtime** — built on Bun APIs with no runtime npm dependencies
 
 ## Quick Start
 
@@ -40,6 +41,9 @@ gai
 
 # Or directly generate a commit message
 gai commit
+
+# Or create an AI-generated pull request
+gai pr
 ```
 
 ## Usage
@@ -49,6 +53,8 @@ gai                Open interactive menu
 gai commit         Generate commit message (interactive file selection)
 gai commit --auto  Auto-stage all changed files
 gai commit -d      Generate message without committing
+gai pr             Create a PR with AI-generated title and body
+gai pr --draft     Create a draft PR
 gai config         Configure API settings
 gai --help         Show help
 gai --version      Show version
@@ -96,6 +102,21 @@ $ gai commit
     1 file changed, 45 insertions(+), 12 deletions(-)
 ```
 
+### Pull Request Flow
+
+`gai pr` detects the remote platform from `origin`:
+
+- GitHub remotes use the `gh` CLI
+- Gitea remotes use the `tea` CLI
+- Unknown remotes prompt you to choose a platform
+
+The command compares your current branch against the default branch, pushes the branch if needed, generates a PR title/body from the branch commits and diff, then asks for confirmation before creating the PR.
+
+```bash
+gai pr
+gai pr --draft
+```
+
 ## Configuration
 
 ### Via `gai config` (interactive)
@@ -110,7 +131,7 @@ gai config
 |---|---|---|
 | `GAI_API_KEY` | — | **Required.** Your API key |
 | `GAI_API_BASE` | `https://api.deepseek.com/v1` | API base URL |
-| `GAI_MODEL` | `deepseek-chat` | Model name |
+| `GAI_MODEL` | `deepseek-v4-flash` | Model name |
 | `GAI_MAX_TOKENS` | `500` | Max response tokens |
 | `GAI_TEMPERATURE` | `0.7` | Sampling temperature |
 
@@ -121,7 +142,7 @@ Bun auto-loads `.env` — no dotenv needed:
 ```bash
 GAI_API_KEY=sk-your-key
 GAI_API_BASE=https://api.deepseek.com/v1
-GAI_MODEL=deepseek-chat
+GAI_MODEL=deepseek-v4-flash
 ```
 
 ### Using other providers
@@ -170,14 +191,16 @@ GAI_MODEL=anthropic/claude-sonnet-4
 │     └─ Directory structure                   │
 │                                              │
 │  2. Collect code changes                     │
-│     └─ git diff --staged                     │
+│     ├─ git diff --staged for commits         │
+│     └─ branch diff for pull requests         │
 │                                              │
 │  3. Collect commit history                   │
-│     └─ git log --oneline -10                 │
+│     ├─ git log --oneline -10 for commits     │
+│     └─ branch commits for pull requests      │
 │                                              │
 │  4. Build prompt → Call AI API               │
 │                                              │
-│  5. Review → Confirm → Commit                │
+│  5. Review → Confirm → Commit or Create PR   │
 └─────────────────────────────────────────────┘
 ```