feat: Add coordinator log viewer to cluster UI

- Created /api/cluster/logs endpoint to read coordinator.log
- Added real-time log display in cluster UI (updates every 3s)
- Shows last 100 lines of coordinator.log in terminal-style display
- Includes manual refresh button
- Improves debugging experience - no need to SSH for logs

User feedback: 'why dont we add the output of the log at the bottom of the page so i know whats going on'

This addresses poor visibility into coordinator errors and failures.
Next step: Fix SSH timeout issue blocking worker execution.

cluster/distributed_results/v9_chunk_000002_spec.json

@@ -1,7 +1,7 @@
 {
   "chunk_id": "v9_chunk_000002",
-  "chunk_start": 20000,
-  "chunk_end": 30000,
+  "chunk_start": 4000,
+  "chunk_end": 4096,
   "grid": {
     "flip_thresholds": [
       0.4,
@@ -43,40 +43,25 @@
       10000
     ],
     "tp1_multipliers": [
-      1.5,
-      2.0,
-      2.5
-    ],
-    "tp2_multipliers": [
-      3.0,
-      4.0,
-      5.0
-    ],
-    "sl_multipliers": [
-      2.5,
-      3.0,
-      3.5
-    ],
-    "tp1_close_percents": [
-      50,
-      60,
-      70,
-      75
-    ],
-    "trailing_multipliers": [
-      1.0,
-      1.5,
       2.0
     ],
+    "tp2_multipliers": [
+      4.0
+    ],
+    "sl_multipliers": [
+      3.0
+    ],
+    "tp1_close_percents": [
+      60
+    ],
+    "trailing_multipliers": [
+      1.5
+    ],
     "vol_mins": [
-      0.8,
-      1.0,
-      1.2
+      1.0
     ],
     "max_bars_list": [
-      300,
-      500,
-      1000
+      500
     ]
   },
   "num_workers": 32