Add per-device routing long-tail: hosts, providers, routes, routing_rules

Storage + CRUD (migration 0006, model, id-keyed store, REST handlers) plus
compiler rendering: each section is owned by a device and projected into that
device's rendered config (hosts/providers/routes/routing_rules).

internal/model/perdevice.go

@@ -0,0 +1,54 @@
+package model
+
+// Per-device long-tail sections. Each is owned by a device (the fleet member it
+// renders on) and maps to the corresponding tomswall config section.
+
+// Host constrains a zone to specific addresses on a device's interface.
+type Host struct {
+	ID         int64    `json:"id"`
+	Device     string   `json:"device"`
+	Zone       string   `json:"zone"`
+	Interface  string   `json:"interface"`
+	Addresses  []string `json:"addresses,omitempty"`
+	Exclusions []string `json:"exclusions,omitempty"`
+	Dynamic    bool     `json:"dynamic,omitempty"`
+}
+
+// Provider is a multi-ISP routing provider on a device.
+type Provider struct {
+	ID        int64    `json:"id"`
+	Device    string   `json:"device"`
+	Name      string   `json:"name"`
+	Number    int      `json:"number"`
+	Mark      int      `json:"mark,omitempty"`
+	Duplicate string   `json:"duplicate,omitempty"`
+	Interface string   `json:"interface"`
+	Gateway   string   `json:"gateway,omitempty"`
+	Copy      []string `json:"copy,omitempty"`
+}
+
+// Route is a static route on a device. Oif is the egress interface (tomswall's
+// route "device" field, renamed to avoid colliding with the fleet device).
+type Route struct {
+	ID         int64  `json:"id"`
+	Device     string `json:"device"`
+	Provider   string `json:"provider,omitempty"`
+	Dest       string `json:"dest"`
+	Gateway    string `json:"gateway,omitempty"`
+	Oif        string `json:"oif,omitempty"`
+	Persistent bool   `json:"persistent,omitempty"`
+	Comment    string `json:"comment,omitempty"`
+}
+
+// RoutingRule directs traffic to a provider's routing table on a device.
+type RoutingRule struct {
+	ID         int64  `json:"id"`
+	Device     string `json:"device"`
+	Source     string `json:"source,omitempty"`
+	Dest       string `json:"dest,omitempty"`
+	Provider   string `json:"provider"`
+	Priority   int    `json:"priority,omitempty"`
+	Persistent bool   `json:"persistent,omitempty"`
+	Mark       string `json:"mark,omitempty"`
+	Comment    string `json:"comment,omitempty"`
+}