Add UART SET_LOG_LEVEL for runtime master ESP-IDF logging.

Expose the command via goTool CLI/REST and dashboard controls so log verbosity can be tuned without reflashing.

Co-authored-by: Cursor <cursoragent@cursor.com>

goTool/webui/index.html

@@ -219,6 +219,8 @@
                 <dd class="col-7" x-text="state.master.running_partition || '—'"></dd>
                 <dt class="col-5 text-muted">Deadzone</dt>
                 <dd class="col-7" x-text="state.master.deadzone != null ? state.master.deadzone + ' LSB' : '—'"></dd>
+                <dt class="col-5 text-muted">Log-Level</dt>
+                <dd class="col-7" x-text="formatLogLevel(masterLogLevel)"></dd>
                 <dt class="col-5 text-muted">LiPo 1</dt>
                 <dd class="col-7" x-text="formatLipo(state.master?.lipo1)"></dd>
                 <dt class="col-5 text-muted">LiPo 2</dt>
@@ -264,6 +266,31 @@
                   Restart
                 </button>
               </div>
+              <label class="form-label text-muted small mb-1 mt-3" for="master-log-level">
+                ESP Log-Level (global)
+              </label>
+              <div class="d-flex flex-wrap gap-2 align-items-end">
+                <select id="master-log-level" class="form-select form-select-sm config-input"
+                        x-model.number="masterLogLevel"
+                        :disabled="busy || !state.uart_connected">
+                  <option value="0">None (aus)</option>
+                  <option value="1">Error</option>
+                  <option value="2">Warn</option>
+                  <option value="3">Info</option>
+                  <option value="4">Debug</option>
+                  <option value="5">Verbose</option>
+                </select>
+                <button type="button" class="btn btn-outline-secondary btn-sm"
+                        @click="readMasterLogLevel()"
+                        :disabled="busy || !state.uart_connected">
+                  Lesen
+                </button>
+                <button type="button" class="btn btn-primary btn-sm"
+                        @click="setMasterLogLevel()"
+                        :disabled="busy || !state.uart_connected">
+                  Setzen
+                </button>
+              </div>
               <p class="text-muted small mt-2 mb-0" x-show="!state.uart_connected">
                 UART nicht verbunden — Eingabe gesperrt.
               </p>
@@ -627,6 +654,7 @@
         ws: null,
         wsConnected: false,
         masterDz: 100,
+        masterLogLevel: 0,
         allDz: 100,
         allTapSingle: false,
         allTapDouble: false,
@@ -766,6 +794,11 @@
             if (data.samples?.length) this.applyBatterySamples(data.samples);
           } catch (_) {}
         },
+        formatLogLevel(level) {
+          const labels = ['None', 'Error', 'Warn', 'Info', 'Debug', 'Verbose'];
+          if (level == null || level < 0 || level > 5) return '—';
+          return `${labels[level]} (${level})`;
+        },
         formatMac(hex) {
           if (!hex || hex.length !== 12) return hex || '';
           return hex.match(/.{2}/g).join(':');
@@ -1104,6 +1137,44 @@
         async setMasterDeadzone() {
           await this.setDeadzone(0, this.masterDz);
         },
+        async readMasterLogLevel() {
+          this.busy = true;
+          try {
+            const r = await fetch('/api/log-level');
+            const data = await r.json();
+            if (!r.ok || !data.success) {
+              this.flash(data.error || 'Log-Level lesen fehlgeschlagen', false);
+              return;
+            }
+            this.masterLogLevel = data.level;
+            this.flash(`Master: Log-Level ${this.formatLogLevel(data.level)}`, true);
+          } catch (e) {
+            this.flash(String(e), false);
+          } finally {
+            this.busy = false;
+          }
+        },
+        async setMasterLogLevel() {
+          this.busy = true;
+          try {
+            const r = await fetch('/api/log-level', {
+              method: 'POST',
+              headers: { 'Content-Type': 'application/json' },
+              body: JSON.stringify({ write: true, level: this.masterLogLevel })
+            });
+            const data = await r.json();
+            if (!r.ok || !data.success) {
+              this.flash(data.error || 'Log-Level setzen fehlgeschlagen', false);
+              return;
+            }
+            this.masterLogLevel = data.level;
+            this.flash(`Master: Log-Level ${this.formatLogLevel(data.level)} gesetzt`, true);
+          } catch (e) {
+            this.flash(String(e), false);
+          } finally {
+            this.busy = false;
+          }
+        },
         patchLiveStream(enabled) {
           let clients = this.state.clients || [];
           if (!enabled) {