fix(android): harden profile validation and log buffering

[AmirrezaFarnamTaheri]

What changed:

• VpnManager: replaced repeated log-list copying with a bounded ArrayDeque ring buffer.
• VpnManager: batches log UI emissions every 150ms during bursts while still parsing scan/status lines immediately.
• ConfigGenerator: resolver generation now deduplicates by normalized endpoint key, preserving different ports like 1.1.1.1:53 and 1.1.1.1:5353.
• ProfilesScreen: profile save now shows clear inline errors for missing name, domain, encryption key, or resolvers.
• ProfilesScreen: removed silent default resolver/profile-name fallback on save/import, so broken profiles are not quietly created.
• strings.xml: added validation messages.

[Hidden-Node]

Excellent work on the log buffering and validation logic. The batching update (150ms) is a great catch for UI performance. Merging now.