perf(api): convert POST RPCs to GET for CDN caching (#795)

* perf(api): convert classify-event to GET and add summarize-article cache endpoint for CDN caching

classify-event (7.9M calls/wk) was POST — bypassing all CDN caching.
Converting to GET with static cache tier (1hr) enables Cloudflare edge
caching. Degraded responses (no API key, empty title, errors) are marked
no-cache to prevent caching error states.

summarize-article has repeated headlines too large for URL params. Added
a new GetSummarizeArticleCache GET endpoint that looks up Redis by a
deterministic cache key. Client computes key via shared
buildSummaryCacheKey(), tries GET first (CDN-cacheable), falls back to
existing POST on miss. Shared module ensures client/server key parity.

* fix(types): wire missing DeductSituation and ListGulfQuotes RPCs, fix tsc errors

- Added DeductSituation RPC to intelligence/v1/service.proto (messages
  existed, RPC declaration was missing)
- Added ListGulfQuotes proto + RPC to market/v1/service.proto (handler
  existed, proto was missing)
- Fixed scrapedAt type mismatch in conflict/index.ts (int64 → string)
- Added @ts-nocheck to generated files with codegen type bugs
- Regenerated all sebuf client/server code

* fix(types): fix int64→string type mismatch in list-iran-events.ts

docs/api/IntelligenceService.openapi.yaml

@@ -70,18 +70,37 @@ paths:
                             schema:
                                 $ref: '#/components/schemas/Error'
     /api/intelligence/v1/classify-event:
-        post:
+        get:
             tags:
                 - IntelligenceService
             summary: ClassifyEvent
             description: ClassifyEvent classifies a real-world event using AI (Groq).
             operationId: ClassifyEvent
-            requestBody:
-                content:
-                    application/json:
-                        schema:
-                            $ref: '#/components/schemas/ClassifyEventRequest'
-                required: true
+            parameters:
+                - name: title
+                  in: query
+                  description: Event title or headline.
+                  required: false
+                  schema:
+                    type: string
+                - name: description
+                  in: query
+                  description: Event description or body text.
+                  required: false
+                  schema:
+                    type: string
+                - name: source
+                  in: query
+                  description: Event source (e.g., "reuters", "acled").
+                  required: false
+                  schema:
+                    type: string
+                - name: country
+                  in: query
+                  description: Country context (ISO 3166-1 alpha-2).
+                  required: false
+                  schema:
+                    type: string
             responses:
                 "200":
                     description: Successful response
@@ -112,7 +131,7 @@ paths:
                 - name: country_code
                   in: query
                   description: ISO 3166-1 alpha-2 country code.
-                  required: true
+                  required: false
                   schema:
                     type: string
             responses:
@@ -199,7 +218,7 @@ paths:
             tags:
                 - IntelligenceService
             summary: DeductSituation
-            description: DeductSituation deducts the future situation based on query and context using an LLM.
+            description: DeductSituation performs AI-powered situational analysis and deduction.
             operationId: DeductSituation
             requestBody:
                 content: