LINUS ROUND 1: Delete dead code (rust/c), generic Store[T], tests, slim main.go

- Removed rust-service/, c-runtime/, kafka stubs
- Generic Store[T] pattern with real tests
- Slimmed main.go from 324 to ~50 lines
- Added config, middleware, store, ledger, pdf tests
- Frontend SPA shell with router
- Binary: 15.5MB -> 12MB

backend/handlers/crm_v2.go

@@ -0,0 +1,109 @@
+// Package handlers provides HTTP handlers using the generic Store pattern.
+// This replaces the old CRMHandler with a generic implementation.
+package handlers
+
+import (
+	"database/sql"
+	"encoding/json"
+	"net/http"
+
+	"github.com/go-chi/chi/v5"
+	"github.com/lib/pq"
+
+	"boc/models"
+	"boc/store"
+)
+
+// CRMHandlerV2 uses the generic Store for customers
+type CRMHandlerV2 struct {
+	customers *store.Store[*models.Customer]
+	db        *store.DB
+}
+
+// NewCRMHandlerV2 creates a new CRM handler using generic store
+func NewCRMHandlerV2(db *store.DB) *CRMHandlerV2 {
+	cols := []string{"id", "name", "email", "phone", "company", "org_number", "status", "source", "tags", "assigned_to", "created_at", "updated_at"}
+	return &CRMHandlerV2{
+		customers: store.NewStore(db, "boc_customers", cols,
+			func(rows *sql.Rows) (*models.Customer, error) {
+				c := &models.Customer{}
+				err := c.ScanRow(rows)
+				return c, err
+			},
+			func(row *sql.Row) (*models.Customer, error) {
+				c := &models.Customer{}
+				err := c.ScanOneRow(row)
+				return c, err
+			},
+		),
+		db: db,
+	}
+}
+
+// ListCustomers handles GET /api/v1/crm/customers
+func (h *CRMHandlerV2) ListCustomers(w http.ResponseWriter, r *http.Request) {
+	status := r.URL.Query().Get("status")
+	if status == "" {
+		status = "active"
+	}
+
+	customers, err := h.customers.List(r.Context(), "status = $1", status)
+	if err != nil {
+		writeError(w, http.StatusInternalServerError, "database error")
+		return
+	}
+
+	writeJSON(w, http.StatusOK, map[string]interface{}{
+		"customers": customers,
+		"total":     len(customers),
+	})
+}
+
+// GetCustomer handles GET /api/v1/crm/customers/{id}
+func (h *CRMHandlerV2) GetCustomer(w http.ResponseWriter, r *http.Request) {
+	id := chi.URLParam(r, "id")
+	customer, err := h.customers.Get(r.Context(), id)
+	if err != nil {
+		writeError(w, http.StatusNotFound, "customer not found")
+		return
+	}
+	writeJSON(w, http.StatusOK, customer)
+}
+
+// CreateCustomer handles POST /api/v1/crm/customers
+func (h *CRMHandlerV2) CreateCustomer(w http.ResponseWriter, r *http.Request) {
+	var req models.Customer
+	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+		writeError(w, http.StatusBadRequest, "invalid request")
+		return
+	}
+
+	var id string
+	err := h.db.QueryRowContext(r.Context(), `
+		INSERT INTO boc_customers (name, email, phone, company, org_number, status, source, tags)
+		VALUES ($1, $2, $3, $4, $5, $6, $7, $8)
+		RETURNING id
+	`, req.Name, req.Email, req.Phone, req.Company, req.OrgNumber, req.Status, req.Source, pq.Array(req.Tags)).Scan(&id)
+
+	if err != nil {
+		writeError(w, http.StatusInternalServerError, "failed to create customer")
+		return
+	}
+
+	writeJSON(w, http.StatusCreated, map[string]interface{}{
+		"id":      id,
+		"message": "Customer created",
+	})
+}
+
+// DeleteCustomer handles DELETE /api/v1/crm/customers/{id}
+func (h *CRMHandlerV2) DeleteCustomer(w http.ResponseWriter, r *http.Request) {
+	id := chi.URLParam(r, "id")
+	if err := h.customers.Delete(r.Context(), id); err != nil {
+		writeError(w, http.StatusInternalServerError, "failed to delete customer")
+		return
+	}
+	writeJSON(w, http.StatusOK, map[string]interface{}{
+		"message": "Customer deleted",
+	})
+}