feat: tambah konfigurasi observability Wrangler untuk konsistensi deployment (#3)

- Aktifkan logging dengan persist & invocation_logs
- Aktifkan tracing dengan persist
- Observability dashboard dimatikan (enabled: false)
- Sampling rate 100% (head_sampling_rate: 1)

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

wrangler.toml

@@ -7,6 +7,22 @@ compatibility_flags = ["nodejs_compat"]
 account_id = "2bfa421c4f4a11cc11d684a3d14327db"
 workers_dev = true
 
+# ── Observability ────────────────────────────────────────────────────────────
+[observability]
+enabled = false
+head_sampling_rate = 1
+
+[observability.logs]
+enabled = true
+head_sampling_rate = 1
+persist = true
+invocation_logs = true
+
+[observability.traces]
+enabled = true
+persist = true
+head_sampling_rate = 1
+
 # ── Environment Variables ───────────────────────────────────────────────────
 # [vars]
 # RELAY_TIMEOUT_MS = "30000"