feat(db): mesh data model — meshes, members, invites, audit log

- pgSchema "mesh" with 4 tables isolating the peer mesh domain
- Enums: visibility, transport, tier, role
- audit_log is metadata-only (E2E encryption enforced at broker/client)
- Cascade on mesh delete, soft-delete via archivedAt/revokedAt

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

packages/shared/src/constants/common.ts

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+/* eslint-disable no-restricted-properties */
+export const NodeEnv = {
+  DEVELOPMENT: "development",
+  PRODUCTION: "production",
+  TEST: "test",
+} as const;
+
+export const SortOrder = {
+  ASCENDING: "asc",
+  DESCENDING: "desc",
+} as const;
+
+export type SortOrder = (typeof SortOrder)[keyof typeof SortOrder];
+
+export const envConfig = {
+  skip:
+    (!!process.env.SKIP_ENV_VALIDATION &&
+      ["1", "true"].includes(process.env.SKIP_ENV_VALIDATION)) ||
+    ["postinstall", "lint"].includes(process.env.npm_lifecycle_event ?? ""),
+} as const;

packages/shared/src/constants/exceptions.ts

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+export const HttpStatusCode = {
+  CONTINUE: 100,
+  SWITCHING_PROTOCOLS: 101,
+  PROCESSING: 102,
+  OK: 200,
+  CREATED: 201,
+  ACCEPTED: 202,
+  NON_AUTHORITATIVE_INFORMATION: 203,
+  NO_CONTENT: 204,
+  RESET_CONTENT: 205,
+  PARTIAL_CONTENT: 206,
+  MULTI_STATUS: 207,
+  ALREADY_REPORTED: 208,
+  IM_USED: 226,
+  MULTIPLE_CHOICES: 300,
+  MOVED_PERMANENTLY: 301,
+  FOUND: 302,
+  SEE_OTHER: 303,
+  NOT_MODIFIED: 304,
+  USE_PROXY: 305,
+  SWITCH_PROXY: 306,
+  TEMPORARY_REDIRECT: 307,
+  PERMANENT_REDIRECT: 308,
+  BAD_REQUEST: 400,
+  UNAUTHORIZED: 401,
+  PAYMENT_REQUIRED: 402,
+  FORBIDDEN: 403,
+  NOT_FOUND: 404,
+  METHOD_NOT_ALLOWED: 405,
+  NOT_ACCEPTABLE: 406,
+  PROXY_AUTHENTICATION_REQUIRED: 407,
+  REQUEST_TIMEOUT: 408,
+  CONFLICT: 409,
+  GONE: 410,
+  LENGTH_REQUIRED: 411,
+  PRECONDITION_FAILED: 412,
+  PAYLOAD_TOO_LARGE: 413,
+  URI_TOO_LONG: 414,
+  UNSUPPORTED_MEDIA_TYPE: 415,
+  RANGE_NOT_SATISFIABLE: 416,
+  EXPECTATION_FAILED: 417,
+  I_AM_A_TEAPOT: 418,
+  MISDIRECTED_REQUEST: 421,
+  UNPROCESSABLE_ENTITY: 422,
+  LOCKED: 423,
+  FAILED_DEPENDENCY: 424,
+  UPGRADE_REQUIRED: 426,
+  PRECONDITION_REQUIRED: 428,
+  TOO_MANY_REQUESTS: 429,
+  REQUEST_HEADER_FIELDS_TOO_LARGE: 431,
+  UNAVAILABLE_FOR_LEGAL_REASONS: 451,
+  INTERNAL_SERVER_ERROR: 500,
+  NOT_IMPLEMENTED: 501,
+  BAD_GATEWAY: 502,
+  SERVICE_UNAVAILABLE: 503,
+  GATEWAY_TIMEOUT: 504,
+  HTTP_VERSION_NOT_SUPPORTED: 505,
+  VARIANT_ALSO_NEGOTIATES: 506,
+  INSUFFICIENT_STORAGE: 507,
+  LOOP_DETECTED: 508,
+  NOT_EXTENDED: 510,
+  NETWORK_AUTHENTICATION_REQUIRED: 511,
+} as const;
+
+export type HttpStatusCode =
+  (typeof HttpStatusCode)[keyof typeof HttpStatusCode];

packages/shared/src/constants/index.ts

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+export * from "./common";
+export * from "./exceptions";