Import source: web/src/lib/types

Import the existing local project snapshot. This commit organizes existing files; it does not represent newly developed functionality.

web/src/lib/types.ts

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+export type TargetState = "up" | "degraded" | "down" | "unknown";
+
+export interface CheckPoint {
+  ts: number;
+  ok: boolean;
+  latency_ms: number;
+  detail?: string;
+  error?: string;
+}
+
+export interface LatencyStats {
+  avg_ms: number;
+  p50_ms: number;
+  p95_ms: number;
+  min_ms: number;
+  max_ms: number;
+}
+
+export interface Incident {
+  id: number;
+  target_id: string;
+  started_at: number;
+  ended_at?: number;
+  error?: string;
+}
+
+export type CheckKind = "http" | "tcp" | "tls" | "icmp" | "docker";
+
+export interface Target {
+  id: string;
+  name: string;
+  type: CheckKind;
+  endpoint: string;
+  interval_sec: number;
+  state: TargetState;
+  fails: number;
+  last?: CheckPoint;
+  uptime_24h?: number;
+  uptime_7d?: number;
+  uptime_30d?: number;
+  latency: LatencyStats;
+  cert_days?: number;
+  incident?: Incident;
+}
+
+export interface Bucket {
+  start: number;
+  total: number;
+  failed: number;
+  avg_latency_ms: number;
+  max_latency_ms: number;
+}
+
+export interface HistoryResponse {
+  target_id: string;
+  range: string;
+  from: number;
+  to: number;
+  points: CheckPoint[];
+  buckets: Bucket[];
+  bucket_ms: number;
+}
+
+export interface CheckEvent {
+  target_id: string;
+  ts: number;
+  ok: boolean;
+  latency_ms: number;
+  detail?: string;
+  error?: string;
+  state: TargetState;
+}
+
+export interface StateEvent {
+  target_id: string;
+  ts: number;
+  state: TargetState;
+  prev_state: TargetState;
+  incident?: Incident;
+}
+
+/** A target enriched with live, client-side stream state. */
+export interface LiveTarget extends Target {
+  /** Increments on every completed probe — drives the pulse animation. */
+  pulse: number;
+  /** Wall time of the last confirmed state transition — drives ripples. */
+  stateChangedAt: number;
+  /** Rolling buffer of recent checks for the sparkline. */
+  series: CheckPoint[];
+}