feat: Add patchset history and diff support with cvsps integration

- Add cvsps package to Docker dependencies
- Implement patchset retrieval and diff endpoints in API
- Add _run_cvsps_command() helper for cvsps integration
- Enhance file history parsing with log message extraction
- Improve UI with enhanced styling and patchset functionality

ui/api.js

@@ -99,6 +99,25 @@ class CVSProxyAPI {
         return this.request(`/diff?${params.toString()}`);
     }
 
+    /**
+     * Get repository patchset history
+     * @returns {Promise<Array>} Array of patchset objects
+     */
+    async getPatchsets() {
+        return this.request('/patchsets');
+    }
+
+    /**
+     * Get diff for a specific patchset
+     * @param {string} patchset - Patchset number
+     * @returns {Promise<object>} Diff object with diff property
+     */
+    async getPatchsetDiff(patchset) {
+        const params = new URLSearchParams();
+        params.append('patchset', patchset);
+        return this.request(`/patchset-diff?${params.toString()}`);
+    }
+
     /**
      * Check API health
      * @returns {Promise<object>} Health status