Enhance distributed agent architecture with full mode support and reliability

Agent improvements:
- Add process verification (0.5s delay + poll check) for sensor, pager, APRS, DSC modes
- Prevents silent failures when SDR is busy or tools fail to start
- Returns clear error messages when subprocess exits immediately

Frontend agent integration:
- Add agent routing to all SDR modes (pager, sensor, RTLAMR, APRS, listening post, TSCM)
- Add agent routing to WiFi and Bluetooth modes with polling fallback
- Add agent routing to AIS and DSC dashboards
- Implement "Show All Agents" toggle for Bluetooth mode
- Add agent badges to device/network lists
- Handle controller proxy response format (nested 'result' field)

Controller enhancements:
- Add running_modes_detail endpoint showing device info per mode
- Support SDR conflict detection across modes

Documentation:
- Expand DISTRIBUTED_AGENTS.md with complete API reference
- Add troubleshooting guide and security considerations
- Document all supported modes with tools and data formats

UI/CSS:
- Add agent badge styling for remote vs local sources
- Add WiFi and Bluetooth table agent columns

static/css/agents.css

@@ -206,11 +206,33 @@
     font-family: 'JetBrains Mono', monospace;
 }
 
-.agent-badge.local {
+.agent-badge.local,
+.agent-badge.agent-local {
     background: rgba(0, 255, 136, 0.1);
     color: var(--accent-green);
 }
 
+.agent-badge.agent-remote {
+    background: rgba(0, 212, 255, 0.1);
+    color: var(--accent-cyan);
+}
+
+/* WiFi table agent column */
+.wifi-networks-table .col-agent {
+    width: 100px;
+    text-align: center;
+}
+
+.wifi-networks-table th.col-agent {
+    font-size: 10px;
+}
+
+/* Bluetooth table agent column */
+.bt-devices-table .col-agent {
+    width: 100px;
+    text-align: center;
+}
+
 .agent-badge-dot {
     width: 6px;
     height: 6px;