feat(credentials): ✨ add provider credential validation warning

Implement a new warning state for valid credentials when the quota is exhausted, allowing users to save their provider connections. Update the response structure and dashboard behavior accordingly.

Author: yacosta738

.codegraph/.gitignore

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+# CodeGraph data files
+# These are local to each machine and should not be committed
+
+# Database
+*.db
+*.db-wal
+*.db-shm
+
+# Cache
+cache/
+
+# Logs
+*.log
+
+# Hook markers
+.dirty

.codegraph/daemon.pid

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+{
+  "pid": 29387,
+  "version": "0.9.9",
+  "socketPath": "/Users/acosta/Dev/dallay/cortex/.codegraph/daemon.sock",
+  "startedAt": 1780824723292
+}

openspec/changes/2026-06-07-credential-validation-warning/state.yaml

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+change: 2026-06-07-credential-validation-warning
+current_phase: archive
+completed: [init, explore, propose, spec, design, tasks, apply, verify, archive]
+next: push
+updated: 2026-06-07