chore(prc-001): followups #54 #55 #57 #58 — emoji validator + opt-in pricing + demo seed + tsconfig

Resuelve 4 de los followups creados post-archive de PRC-001:

#55 — Decisión de negocio (2026-04-21): emojis NO se permiten en Symbol config.
  - WordCounterService.ContainsEmoji(string): helper publico que reutiliza los
    rangos Unicode de IsEmojiRune (Emoticons, Pictographs, Dingbats, VS-16, ZWJ).
  - CreateChargeableCharConfigCommandValidator: regla .Must que rechaza emoji
    en Symbol con mensaje claro. Defensiva: cubre clientes directos al API
    (Postman, adversariales) mas alla del SymbolInput blocker del frontend.
  - Tests: 5 emojis positivos (smile/car/fire/heart VS-16/sun) + 8 plain symbols
    ($, %, !, ¡, @, €, ##, ABCD) + actualizacion del Api test E2E (Post_WithEmojiSymbol).

#57 — Alineacion FluentValidation con opt-in billing (CK_Price_NonNegative >= 0).
  - CreateChargeableCharConfigCommandValidator.PricePerUnit: GreaterThan(0)
    -> GreaterThanOrEqualTo(0). Mensaje explica el significado: 0 = no cobra.
  - Tests actualizados: PricePerUnit_Zero ahora Passes (era Fails). Negative
    sigue fallando. Api e2e usa -1 para el caso de rechazo.

#58 — tsconfig ignoreDeprecations + MSW handler (parte a).
  - src/web/tsconfig.json: agrega "ignoreDeprecations": "6.0" para silenciar
    el warning TS5101 del baseUrl deprecated en TS 6.x.
  - (El MSW handler de /api/v1/admin/product-types no aplica — los tests ya
    mockean ProductTypeSelect directamente; warning residual no existe.)

#54 — Seeder demo de overrides ficticios per-ProductType (V025).
  - database/migrations/V025__seed_chargeable_char_overrides_demo.sql:
    MERGE idempotente que crea overrides de ChargeableCharConfig para
    ProductTypes Clasificado/Notables/Fúnebres si existen en la DB.
    Precios ficticios ($ 5-8, % 3-5, ! 2-4, ¡ 2-4). No-op si los tipos no
    estan seedados (sera cuando PRD-008 haga seed de los 12 legacy).
  - V025_ROLLBACK.sql: elimina overrides demo preservando globales.
  - Aplicado en SIGCM2, SIGCM2_Test_App, SIGCM2_Test_Api.
  - database/README.md: V025 agregada al indice.

Tests: 1659 .NET (1310 Application + 349 Api) + 510 vitest — todos GREEN.

Closes #54, #55, #57, #58.

tests/SIGCM2.Api.Tests/Pricing/ChargeableChars/ChargeableCharConfigControllerTests.cs

@@ -243,9 +243,11 @@ public sealed class ChargeableCharConfigControllerTests : IAsyncLifetime
     [Fact]
     public async Task Post_InvalidPrice_Returns400ValidationFailure()
     {
+        // PRC-001 followup #57: PricePerUnit >= 0 is now valid (opt-in billing).
+        // Use -1 to still exercise the negative rejection path.
         var token = GetAdminToken();
         using var req = BuildRequest(HttpMethod.Post, "/api/v1/admin/chargeable-chars",
-            body: new { productTypeId = (long?)null, symbol = "£", category = "Currency", pricePerUnit = 0m, validFrom = TomorrowStr() },
+            body: new { productTypeId = (long?)null, symbol = "£", category = "Currency", pricePerUnit = -1m, validFrom = TomorrowStr() },
             token: token);
         var resp = await _client.SendAsync(req);
         resp.StatusCode.Should().Be(HttpStatusCode.BadRequest);
@@ -276,25 +278,22 @@ public sealed class ChargeableCharConfigControllerTests : IAsyncLifetime
     }
 
     /// <summary>
-    /// PRC-001-R2.7 — Emoji symbols are explicitly DEFERRED per spec.
-    /// The ChargeableCharConfig Symbol field accepts any 1–4 char value including emojis.
-    /// "😀" in C# has string.Length = 2 (UTF-16 surrogate pair), so it passes MaximumLength(4).
-    /// This test documents the deferred behavior: emoji in Symbol is accepted at config level.
-    /// The EmojiDetectedException applies only to WordCounterService (ad text, not config symbols).
+    /// PRC-001 followup #55 — Business decision (2026-04-21): emoji Symbols are NOT allowed.
+    /// Validator delegates to WordCounterService.ContainsEmoji which checks every rune against
+    /// the Unicode emoji ranges (Emoticons, Pictographs, Dingbats, VS-16, ZWJ, etc.).
+    /// This provides a defensive check beyond the frontend SymbolInput blocker — direct API
+    /// calls (Postman, adversarial clients) can't bypass it.
     /// </summary>
     [Fact]
-    public async Task Post_WithEmojiSymbol_Returns201_BecauseEmojiRejectionIsDeferred()
+    public async Task Post_WithEmojiSymbol_Returns400()
     {
         var token = GetAdminToken();
-        // "😀" has C# string.Length == 2 (UTF-16 surrogate pair) — passes MaximumLength(4).
-        // Emoji rejection for config Symbols is deferred to PRC-002+ per spec R2.7.
         using var req = BuildRequest(HttpMethod.Post, "/api/v1/admin/chargeable-chars",
             body: new { productTypeId = (long?)null, symbol = "😀", category = "Currency", pricePerUnit = 1.0m, validFrom = TomorrowStr() },
             token: token);
         var resp = await _client.SendAsync(req);
-        // Accepted: emoji symbols deferred per spec. If business later rejects them, update validator + this test.
-        resp.StatusCode.Should().Be(HttpStatusCode.Created,
-            because: "emoji symbol rejection is deferred (spec R2.7). Symbol '😀' has length 2 in C# (UTF-16) → passes MaximumLength(4)");
+        resp.StatusCode.Should().Be(HttpStatusCode.BadRequest,
+            because: "emoji symbols are rejected by validator via WordCounterService.ContainsEmoji (#55)");
     }
 
     // ── PUT /api/v1/admin/chargeable-chars/{id}/price ────────────────────────

tests/SIGCM2.Application.Tests/Pricing/ChargeableChars/CreateChargeableCharConfigCommandValidatorTests.cs

@@ -92,10 +92,13 @@ public class CreateChargeableCharConfigCommandValidatorTests
     // ── PricePerUnit ─────────────────────────────────────────────────────────────
 
     [Fact]
-    public void PricePerUnit_Zero_FailsValidation()
+    public void PricePerUnit_Zero_Passes_OptInBilling()
     {
+        // PRC-001 followup #57: opt-in billing — 0 is a valid price meaning
+        // "this Symbol exists but does NOT charge extra for this ProductType".
+        // Aligned with DB check constraint CK_ChargeableCharConfig_Price_NonNegative (>= 0).
         var cmd = ValidCmd() with { PricePerUnit = 0m };
-        _validator.TestValidate(cmd).ShouldHaveValidationErrorFor(x => x.PricePerUnit);
+        _validator.TestValidate(cmd).ShouldNotHaveValidationErrorFor(x => x.PricePerUnit);
     }
 
     [Fact]
@@ -112,6 +115,35 @@ public class CreateChargeableCharConfigCommandValidatorTests
         _validator.TestValidate(cmd).ShouldNotHaveValidationErrorFor(x => x.PricePerUnit);
     }
 
+    // ── Symbol emoji rejection (PRC-001 followup #55) ───────────────────────────
+
+    [Theory]
+    [InlineData("😀")]          // smiley face (U+1F600, Emoticons block)
+    [InlineData("🚗")]          // car (U+1F697, Transport block)
+    [InlineData("🔥")]          // fire (U+1F525, Misc Symbols & Pictographs)
+    [InlineData("❤️")]          // red heart + VS-16 (U+2764 U+FE0F)
+    [InlineData("☀️")]          // sun (U+2600 in Misc Symbols block)
+    public void Symbol_WithEmoji_FailsValidation(string emojiSymbol)
+    {
+        var cmd = ValidCmd() with { Symbol = emojiSymbol };
+        _validator.TestValidate(cmd).ShouldHaveValidationErrorFor(x => x.Symbol);
+    }
+
+    [Theory]
+    [InlineData("$")]
+    [InlineData("%")]
+    [InlineData("!")]
+    [InlineData("¡")]
+    [InlineData("@")]
+    [InlineData("€")]
+    [InlineData("##")]
+    [InlineData("ABCD")]
+    public void Symbol_WithoutEmoji_Passes(string plainSymbol)
+    {
+        var cmd = ValidCmd() with { Symbol = plainSymbol };
+        _validator.TestValidate(cmd).ShouldNotHaveValidationErrorFor(x => x.Symbol);
+    }
+
     // ── ValidFrom ────────────────────────────────────────────────────────────────
 
     [Fact]