Complete private Monero miner control stack.

Implement Windows agent with RandomX mining and WebSocket fleet reporting, wire dashboard settings into the builder with saved exe paths, and add project README.

server/internal/api/config_handler.go

@@ -0,0 +1,62 @@
+package api
+
+import (
+	"encoding/json"
+	"net/http"
+
+	"crypto-miner-server/internal/db"
+)
+
+// ConfigHandler handles GET/PUT for server configuration settings
+type ConfigHandler struct {
+	db     *db.Database
+	config ConfigProvider
+}
+
+// ConfigProvider is an interface for the server config so we don't import main package
+type ConfigProvider interface {
+	GetConfigJSON() json.RawMessage
+	UpdateConfigFromJSON(data json.RawMessage) error
+}
+
+func NewConfigHandler(database *db.Database, cp ConfigProvider) *ConfigHandler {
+	return &ConfigHandler{
+		db:     database,
+		config: cp,
+	}
+}
+
+func (h *ConfigHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	switch r.Method {
+	case http.MethodGet:
+		h.getConfig(w, r)
+	case http.MethodPut:
+		h.updateConfig(w, r)
+	default:
+		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
+	}
+}
+
+// GET /api/v1/config
+func (h *ConfigHandler) getConfig(w http.ResponseWriter, r *http.Request) {
+	configJSON := h.config.GetConfigJSON()
+	w.Header().Set("Content-Type", "application/json")
+	w.Write(configJSON)
+}
+
+// PUT /api/v1/config
+func (h *ConfigHandler) updateConfig(w http.ResponseWriter, r *http.Request) {
+	var body json.RawMessage
+	if err := json.NewDecoder(r.Body).Decode(&body); err != nil {
+		http.Error(w, `{"error":"Invalid JSON"}`, http.StatusBadRequest)
+		return
+	}
+
+	if err := h.config.UpdateConfigFromJSON(body); err != nil {
+		http.Error(w, `{"error":"`+err.Error()+`"}`, http.StatusInternalServerError)
+		return
+	}
+
+	// Return updated config
+	h.getConfig(w, r)
+}