refactor: notify/footer 持久配置收编到 config/，chrome bridge 地址固定

仓库规则要求 config/ 为唯一配置来源、不以环境变量作持久默认值：
- pi-notify 改读 config/pi-notify.json（逐字段校验回退，复用原 parsers 钳制）
- pi-minimal-footer 改读 config/pi-minimal-footer.json
- pi-chrome 移除 PI_CHROME_BRIDGE_HOST/PORT，固定 127.0.0.1:17318
  （浏览器端 service_worker.js 硬编码同一地址，单侧可配只会断连）

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Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

pi-notify/src/config.ts

@@ -1,13 +1,6 @@
 import type { ExtensionContext } from "@earendil-works/pi-coding-agent";
 import { extractMessageText, truncateText } from "./messages.ts";
-import {
-  parseEnabled,
-  parseKittyVisibility,
-  parseMessageMax,
-  parseMessageSource,
-  parseMinDurationMs,
-  parseNotificationAction,
-} from "./parsers.ts";
+import { readNotifySettings, type NotifySettings } from "./settings.ts";
 import { renderTemplate } from "./template.ts";
 import type { NotificationRuntimeValues, NotifyConfig } from "./types.ts";
 
@@ -20,12 +13,13 @@ export function getConfig(
   messages: unknown[] | undefined,
   runtime: NotificationRuntimeValues,
   now = Date.now(),
+  settings: NotifySettings = readNotifySettings(),
 ): NotifyConfig {
   const durationMs = startedAt === undefined ? 0 : Math.max(0, now - startedAt);
-  const messageMax = parseMessageMax(process.env.PI_NOTIFY_MESSAGE_MAX);
+  const messageMax = settings.messageMax;
   const userMessage = truncateText(extractMessageText(messages, "user"), messageMax);
   const assistantMessage = truncateText(extractMessageText(messages, "assistant"), messageMax);
-  const messageSource = parseMessageSource(process.env.PI_NOTIFY_MESSAGE_SOURCE);
+  const messageSource = settings.messageSource;
   const selectedMessage = messageSource === "user" ? userMessage : messageSource === "assistant" ? assistantMessage : "";
   const message = selectedMessage || "Ready for input";
   const toolErrorCount = Math.max(0, runtime.toolErrorCount ?? 0);
@@ -39,15 +33,15 @@ export function getConfig(
   };
 
   return {
-    enabled: parseEnabled(process.env.PI_NOTIFY_ENABLED),
-    title: renderTemplate(process.env.PI_NOTIFY_TITLE || DEFAULT_TITLE, ctx, durationMs, values),
-    body: renderTemplate(process.env.PI_NOTIFY_BODY || DEFAULT_BODY, ctx, durationMs, values),
+    enabled: settings.enabled,
+    title: renderTemplate(settings.title || DEFAULT_TITLE, ctx, durationMs, values),
+    body: renderTemplate(settings.body || DEFAULT_BODY, ctx, durationMs, values),
     durationMs,
-    minDurationMs: parseMinDurationMs(process.env.PI_NOTIFY_MIN_SECONDS),
+    minDurationMs: settings.minDurationMs,
     notificationId: runtime.notificationId,
-    visibility: parseKittyVisibility(process.env.PI_NOTIFY_VISIBILITY),
-    action: parseNotificationAction(process.env.PI_NOTIFY_ACTION),
-    soundCommand: process.env.PI_NOTIFY_SOUND_CMD?.trim() || undefined,
+    visibility: settings.visibility,
+    action: settings.action,
+    soundCommand: settings.soundCommand,
   };
 }