refactor: purge Node.js, Rust is the one true backend

- Moved boosapi-rs/* to repo root
- Deleted all Node.js source (src/server/, src/web/, scripts/)
- Deleted node_modules, package.json, tsconfig, vite.config
- Updated .gitignore and AGENTS.md for Rust-only stack
- Fixed static file path for frontend dist/web/
- Dockerfile stays the same (already Rust-only)
- Kept dist/web/ for Rust static serving

src/proxy/cli_profiles/mod.rs

@@ -0,0 +1,43 @@
+use serde::{Deserialize, Serialize};
+
+#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
+pub enum CliProfileKind {
+    Codex,
+    ClaudeCode,
+    GeminiCli,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
+pub struct CliProfile {
+    pub id: &'static str,
+    pub kind: CliProfileKind,
+    pub display_name: &'static str,
+    pub default_model: &'static str,
+    pub env_key_name: &'static str,
+}
+
+pub fn builtin_profiles() -> Vec<CliProfile> {
+    vec![
+        CliProfile {
+            id: "codex",
+            kind: CliProfileKind::Codex,
+            display_name: "Codex CLI",
+            default_model: "gpt-5.5",
+            env_key_name: "OPENAI_API_KEY",
+        },
+        CliProfile {
+            id: "claude-code",
+            kind: CliProfileKind::ClaudeCode,
+            display_name: "Claude Code",
+            default_model: "claude-sonnet-4",
+            env_key_name: "ANTHROPIC_API_KEY",
+        },
+        CliProfile {
+            id: "gemini-cli",
+            kind: CliProfileKind::GeminiCli,
+            display_name: "Gemini CLI",
+            default_model: "gemini-2.0-flash",
+            env_key_name: "GEMINI_API_KEY",
+        },
+    ]
+}