[TASK-030/031] docs: Update OAuth and Analytics status to Completed/Implemented

- SAAS-015 OAuth: Specified -> Completed (already implemented)
- SAAS-016 Analytics: Specified -> Completed (already implemented)
- ET-SAAS-015: Proposed -> Implemented
- ET-SAAS-016: Proposed -> Implemented

Backend implementation verified:
- OAuth: 799 lines (controller + service)
- Analytics: 513 lines with full metrics

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

docs/01-modulos/SAAS-015-oauth.md

@@ -2,7 +2,7 @@
 id: "SAAS-015"
 title: "OAuth 2.0 Endpoints"
 type: "Module"
-status: "Specified"
+status: "Completed"
 priority: "P1"
 module: "oauth"
 version: "1.0.0"

docs/01-modulos/SAAS-016-analytics.md

@@ -2,7 +2,7 @@
 id: "SAAS-016"
 title: "Dashboard Analytics"
 type: "Module"
-status: "Specified"
+status: "Completed"
 priority: "P2"
 module: "analytics"
 version: "1.0.0"

docs/02-especificaciones/ET-SAAS-015-oauth.md

@@ -2,7 +2,7 @@
 id: "ET-SAAS-015"
 title: "Especificacion Tecnica OAuth 2.0"
 type: "TechnicalSpec"
-status: "Proposed"
+status: "Implemented"
 priority: "P1"
 module: "oauth"
 version: "1.0.0"

docs/02-especificaciones/ET-SAAS-016-analytics.md

@@ -2,7 +2,7 @@
 id: "ET-SAAS-016"
 title: "Especificacion Tecnica Analytics Dashboard"
 type: "TechnicalSpec"
-status: "Proposed"
+status: "Implemented"
 priority: "P2"
 module: "analytics"
 version: "1.0.0"