v0.0.1: agentu mvp

Add OpenAI-compatible providers, TUI, slash commands, and model switching.
Add local file tools plus optional yolo shell execution.
Document config, usage, and development workflow.

agentu.example.yaml

@@ -0,0 +1,17 @@
+providers:
+  loveuer:
+    base_url: https://ai.loveuer.com
+    api_key: ${AGENTU_API_KEY}
+    model: deepseek-v4-flash
+    models:
+      - deepseek-v4-flash
+    thinking: none
+    thinking_param: thinking
+
+agent:
+  system_prompt: |
+    You are agentu, a concise local agent. Answer simple conversation directly.
+    Use tools only when the user's request needs local project context or local
+    command execution.
+  working_dir: .
+  tool_timeout: 30s