chore: initialize git repo, add matplotlib dep, extend config

- Add .gitignore for Python/data/models
- Add matplotlib>=3.8.0 for eval plots
- Add PretrainConfig, FinetuneConfig, BalabitAdapterConfig, EvalConfig dataclasses

static/js/api.js

@@ -0,0 +1,39 @@
+/**
+ * API utilities: axios instance and SSE helper.
+ */
+
+export const API_BASE = ''
+
+export const api = axios.create({ baseURL: '/api' })
+
+/**
+ * Consume a Server-Sent Events stream from a POST endpoint.
+ * @param {string} url - The URL to POST to (e.g. '/api/train')
+ * @param {object} body - JSON body to send
+ * @param {function} onMessage - Callback invoked with each parsed SSE message object
+ * @returns {Promise<void>}
+ */
+export async function fetchSSE(url, body, onMessage) {
+  const resp = await fetch(url, {
+    method: 'POST',
+    headers: { 'Content-Type': 'application/json' },
+    body: JSON.stringify(body),
+  })
+  const reader = resp.body.getReader()
+  const dec = new TextDecoder()
+  let buf = ''
+
+  while (true) {
+    const { done, value } = await reader.read()
+    if (done) break
+    buf += dec.decode(value, { stream: true })
+    const parts = buf.split('\n\n')
+    buf = parts.pop()
+    for (const part of parts) {
+      const line = part.trim()
+      if (!line.startsWith('data:')) continue
+      const msg = JSON.parse(line.slice(5).trim())
+      onMessage(msg)
+    }
+  }
+}