feat(matrix-mas): 3 helpers for matrix_client_pc (issue 0147)

- mas_oidc_loopback_go_infra: OAuth2 PKCE + loopback HTTP for desktop login
- keyring_token_store_go_infra: persist OAuth tokens in SO keychain
- matrix_client_init_go_infra: init mautrix.Client from access_token + whoami

Plus go.work workspace including matrix_client_pc sub-repo for shared
import path during dev. All 3 fns tagged matrix-mas capability group.

Tests: TestMasOidcLoopback (15 cases), TestKeyringTokenStore (5 cases,
SKIP on headless), TestMatrixClientInit (6 cases) — all green/skip.

Refs: dev/issues/0147-matrix-client-pc-scaffold.md
Refs: dataforge/matrix_client_pc commit f28c2b1

go.sum

@@ -1,3 +1,5 @@
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@@ -90,6 +96,8 @@ github.com/lucasb-eyer/go-colorful v1.3.0 h1:2/yBRLdWBZKrf7gB40FoiKfAWYQ0lqNcbuQ
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@@ -142,10 +166,14 @@ github.com/xyproto/randomstring v1.0.5/go.mod h1:rgmS5DeNXLivK7YprL0pY+lTuhNQW3i
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@@ -159,12 +187,18 @@ golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9/go.mod h1:LzIPMQfyMNhhGPh
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@@ -220,5 +264,7 @@ gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c/go.mod h1:JHkPIbrfpd72SG/EV
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