Load config, harden processing and notifications

- Actually load configs/config.yaml at startup (init_config was commented out)
- Add timeouts and error handling to all HTTP calls; run blocking requests
  in threads; serialize processing with a lock; run initial check in background
- URL-encode Telegram messages and HTML-escape scraped data
- Fix GPV crash on empty schedule, 00:00 end time, date sorting and fallback format
- Parse PO table per row; fix daily reminder check and change detection
- Use per-instance timestamps in dataclasses; robust config value parsing
- Matrix: use v3 PUT send endpoint; strip secrets from logged errors
- Resolve templates/static/test paths relative to the project; use lifespan
- Move debug GPV data to test/data_gpv.json; add CLAUDE.md

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

test/data_gpv.json

@@ -0,0 +1,66 @@
+{
+  "current": {
+    "gav": {
+      "message": "Черга спеціальних аварійних відключень (СГАВ):",
+      "queue": null
+    },
+    "hasQueue": "yes",
+    "note": "Станом на 21:05 14.01.2026 за вказаним особовим рахунком '30014180' споживач підпадає під чергу '5.1' Графіку погодинного відключення(ГПВ)",
+    "queue": 5,
+    "sgav": {
+      "message": "Черга спеціальних аварійних відключень (СГАВ):",
+      "queue": null
+    },
+    "subQueue": 1
+  },
+  "schedule": [
+    {
+      "createdAt": "14.01.2026 19:11",
+      "eventDate": "15.04.2026",
+      "queues": {
+        "5.1": [
+          {
+            "from": "07:30",
+            "shutdownHours": "07:30-11:00",
+            "status": 1,
+            "to": "11:00"
+          },
+          {
+            "from": "14:30",
+            "shutdownHours": "14:30-20:00",
+            "status": 1,
+            "to": "20:00"
+          },
+          {
+            "from": "22:00",
+            "shutdownHours": "22:00-00:00",
+            "status": 1,
+            "to": "00:00"
+          }
+        ]
+      },
+      "scheduleApprovedSince": "14.04.2026 19:11"
+    },
+    {
+      "createdAt": "13.04.2026 20:28",
+      "eventDate": "14.04.2026",
+      "queues": {
+        "5.1": [
+          {
+            "from": "03:00",
+            "shutdownHours": "03:00-07:00",
+            "status": 1,
+            "to": "07:00"
+          },
+          {
+            "from": "11:00",
+            "shutdownHours": "11:00-17:30",
+            "status": 1,
+            "to": "17:30"
+          }
+        ]
+      },
+      "scheduleApprovedSince": "14.04.2026 09:56"
+    }
+  ]
+}