feat!: remove the old API, ports 8081 and 8080 (step 4a)

Step 4a of docs/SECURITY_PLAN.md. Port 80 keeps the eleven HTTP routes of
ADR 0006 and the socket at /ws; everything else moved to protocol 2.

- Port 8081 (ApiRoutes) and the socket on 8080 (SocketEmitter) are gone.
  Protocol 2 owns its frame buffer and loop-task check.
- Port 80 drops every route the old web UI called: reads, edits,
  settings, scans, reboot, /shades.cfg, /discovery. HttpRoutes.cpp holds
  what stays.
- ModelSnapshot, SnapshotSlots and the read documents are gone. The item
  snapshot types stay, as ItemSnapshot, for events, MQTT and the command
  replies.
- Model edits reply only to their protocol 2 op: requestResult goes.
- The settings' toJSON writers, used only by the settings routes, go.
- The _espsomfy_rts._tcp mDNS record moves to port 80, with path=/ws.
- The memory event reports the loop-rate window it closes.
- A deleted room no longer re-publishes its retained MQTT topics.
- e2e: the heap check reads the sync's status; the sync is checked on
  its own instead of against /controller.
- README gets an API and ports section.

BREAKING CHANGE: ports 8081 and 8080 and the old HTTP routes are gone.
Home Assistant needs integration 3.0.0 or newer.

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

src/Somfy.h

@@ -2,7 +2,6 @@
 #define SOMFY_H
 #include <Preferences.h>
 #include "ConfigSettings.h"
-#include "WResp.h"
 
 #include "SomfyFrame.h"
 #include "TxBuffer.h"
@@ -32,8 +31,6 @@ class SomfyRoom {
     void clear();
     bool save();
     bool fromJSON(JsonObject &obj);
-    void emitState(const char *evt = "roomState");
-    void emitState(uint8_t num, const char *evt = "roomState");
     void publish();
     void unpublish();
 };
@@ -136,15 +133,11 @@ class SomfyShade : public SomfyRemote, public ShadeSettings, private MotorLink,
     // Marks the shade as changed; the change fan-out sends shadeState once per
     // loop() pass.
     void emitState();
-    // Sends evt about the shade to every client now.
-    void emitState(const char *evt);
-    void emitState(uint8_t num, const char *evt = "shadeState");
     // What changed since the fan-out last sent the shade (SHADE_CHANGED_* bits).
     uint16_t changed = 0;
     // A setting changed: protocol 2 clients get the whole shade.
     void configChanged() { this->changed |= SHADE_CHANGED_CONFIG; }
-    void emitCommand(somfy_commands cmd, const char *source, uint32_t sourceAddress, const char *evt = "shadeCommand");
-    void emitCommand(uint8_t num, somfy_commands cmd, const char *source, uint32_t sourceAddress, const char *evt = "shadeCommand");
+    void emitCommand(somfy_commands cmd, const char *source, uint32_t sourceAddress);
     // False when the radio refused a command it sent.
     bool setMyPosition(int8_t pos, int8_t tilt = -1);
     bool moveToMyPosition();
@@ -213,9 +206,6 @@ class SomfyGroup : public SomfyRemote {
     // Marks the group as changed; the change fan-out sends groupState once per
     // loop() pass.
     void emitState();
-    // Sends evt about the group to every client now.
-    void emitState(const char *evt);
-    void emitState(uint8_t num, const char *evt = "groupState");
     // What changed since the fan-out last sent the group (GROUP_CHANGED_* bits).
     uint8_t changed = 0;
     // A setting or its shades changed: protocol 2 clients get the whole group.
@@ -278,7 +268,6 @@ class SomfyShadeController {
     void processFrame(somfy_frame_t &frame, bool internal = false, const SomfyRemote *skip = nullptr);
     void markTxPending(uint32_t remoteAddress, uint32_t ticket, const SomfyRemote *skip = nullptr);
     void processTxEvent(const somfy_tx_event_t &evt);
-    void emitState(uint8_t num = 255);
     // The change fan-out: sends every shade and group that changed since the
     // last pass, its changed MQTT topics and one state event.  loop() only.
     void sendChanges();
@@ -287,7 +276,6 @@ class SomfyShadeController {
     void commit();
     void writeBackup();
     String backupData;
-    bool loadShadesFile(const char *filename);
 };
 
 #endif