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/tests/config.test.ts

@@ -1,28 +1,18 @@
 import assert from "node:assert/strict";
-import { afterEach, describe, it } from "node:test";
+import { describe, it } from "node:test";
 import type { ExtensionContext } from "@earendil-works/pi-coding-agent";
 import { getConfig, shouldNotify } from "../src/config.ts";
+import type { NotifySettings } from "../src/settings.ts";
 
-const envKeys = [
-  "PI_NOTIFY_ENABLED",
-  "PI_NOTIFY_TITLE",
-  "PI_NOTIFY_BODY",
-  "PI_NOTIFY_MESSAGE_SOURCE",
-  "PI_NOTIFY_MESSAGE_MAX",
-  "PI_NOTIFY_MIN_SECONDS",
-  "PI_NOTIFY_VISIBILITY",
-  "PI_NOTIFY_ACTION",
-  "PI_NOTIFY_SOUND_CMD",
-] as const;
-
-const savedEnv = new Map(envKeys.map((key) => [key, process.env[key]]));
-
-afterEach(() => {
-  for (const key of envKeys) {
-    const value = savedEnv.get(key);
-    if (value === undefined) delete process.env[key];
-    else process.env[key] = value;
-  }
+const defaultSettings = (): NotifySettings => ({
+  enabled: true,
+  title: "π - {project}",
+  body: "{message}",
+  messageSource: "assistant",
+  messageMax: 80,
+  minDurationMs: 3_000,
+  visibility: "always",
+  action: "focus",
 });
 
 function context(): ExtensionContext {
@@ -45,6 +35,7 @@ describe("config", () => {
       ],
       runtime,
       5_000,
+      defaultSettings(),
     );
 
     assert.deepEqual(config, {
@@ -62,19 +53,20 @@ describe("config", () => {
   });
 
   it("supports privacy, threshold, focus, and status template settings", () => {
-    process.env.PI_NOTIFY_ENABLED = "off";
-    process.env.PI_NOTIFY_TITLE = "{status_icon} {status} {tool_error_count}";
-    process.env.PI_NOTIFY_BODY = "{message}";
-    process.env.PI_NOTIFY_MESSAGE_SOURCE = "none";
-    process.env.PI_NOTIFY_MIN_SECONDS = "10.5";
-    process.env.PI_NOTIFY_VISIBILITY = "invisible";
-    process.env.PI_NOTIFY_ACTION = "none";
-    process.env.PI_NOTIFY_SOUND_CMD = " say done ";
-
     const config = getConfig(context(), 1_000, [{ role: "assistant", content: "secret" }], {
       notificationId: "pi-session",
       toolErrorCount: 2,
-    }, 2_000);
+    }, 2_000, {
+      ...defaultSettings(),
+      enabled: false,
+      title: "{status_icon} {status} {tool_error_count}",
+      body: "{message}",
+      messageSource: "none",
+      minDurationMs: 10_500,
+      visibility: "invisible",
+      action: "none",
+      soundCommand: "say done",
+    });
 
     assert.equal(config.title, "⚠ ready · 2 tool errors 2");
     assert.equal(config.body, "Ready for input");
@@ -88,15 +80,13 @@ describe("config", () => {
   });
 
   it("applies selected-message truncation and a session override", () => {
-    process.env.PI_NOTIFY_MESSAGE_SOURCE = "user";
-    process.env.PI_NOTIFY_MESSAGE_MAX = "5";
-    process.env.PI_NOTIFY_MIN_SECONDS = "0";
     const config = getConfig(
       context(),
       1_000,
       [{ role: "user", content: "hello world" }],
       runtime,
       2_000,
+      { ...defaultSettings(), messageSource: "user", messageMax: 5, minDurationMs: 0 },
     );
 
     assert.equal(config.body, "hell…");